You'll Be Shocked By Just How Much a Roof Top Tent Kills Your Fuel Economy!
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- ( www.TFLcar.com ) Roof Top Tents seem to be all the rage. Today we test our VW Touareg on our MPG loop to see how much the efficiency drops by adding a RTT.
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That was quite a bit of a loss. Nice to know some real world numbers. Great review as always!
How about a roof carrier vs towing a small trailer?
Good idea. Thanks for the suggestion.
@@TFLcar Yes please I think I lost about 3 MPG with my carrier this past trip, but also the vehicle was weighed down, so you rmay want to do two tests. Carrier unloaded and carried fully loaded with a decent amount of camping gear, sleeping bags, tent, chairs mattresses etc. Would be a good comparison with the roof tent or throw tent into carrier?
Great idea! From experience a small and lightweight camping trailer will increase the fuel consumption by about the same percentage, but usually the trailer will provide much more space for camping, but will also cost quite a bit more...
a hitch box of high capacity vs roof
The Fast Lane Car or rear cargo carrier
If it’s running by the end of the video I’d consider it a win.
Was not shocked. Actually I was a little shocked how well the T-reg did without the tent.
I'd be pumped just to get the lower mpg on my 2009 GX with nothing on it.
@@JCintheBCC ditto my 08
That GX sucks....gas.
2008 Highlander got 27.5 mpg at 65 mph for hours.
26mpg at continuous 72 mph.
At well above 75mph it still got 24.4 mpg continuous for hours ...must have been the driving "downhill" from VA to FL.
Yep. My 08 cts only gets 22.1 here near sea level in Texas.
My 05 GX without RTT get around 16-17 mpg on the highway (lifted slightly with 32" KO2 and custom low profile aluminum roof rack) at 75mph. With CVT Mt Rainer RTT (3 person tent, 6ft by 4ft by 1.5ft folded up), I get around 13-14 mpg at 75mph on the highway (which is the same as in the city). If I tow my 3800# popup camper with my RTT installed and 6 people (3 adults and 3 kids) in the GX, I get around 8-10mpg depending on hills and inclines. On flat areas, I can get 10-12mpg while towing the 3800# camper. This is towing within Oregon and Washington state. Towing with RTT doesn't really affect mpg much because 1) towing speed limited and 2) towing itself ate up most of the mpg since you are already a brick on the highway.
Keep in mind that at highway speeds, 10-20 mph extra make a massive difference in fuel economy. The difference between 60 mph-70 mph is huge compared to 50 mph-60mph.
Yes, we should all go 25
@@uweschroeder damn, 25 mph sure is far off from the speed that I stated. lol that being said, in all seriousness there's also a point at which you're going so slow that it's not any more efficient to go that slow. And 25 is definitely below that limit. :P like for instance, I drive a 2015 Honda Odyssey and typically on the highway I'll cruise in the right lane at about 54 mph (generally 40 mph is the minimum speed allowed in the right lane) and on a 35 miles stretch of interstate I was able to achieve 38 mpg with the ac on. My Ody should be getting 28 mpg at highway speeds. That is obviously a crazy number to pull for my vehicle. But hey, I'm a patient man that drives 3,000 miles a month so it's worth it to me to go that speed.
@@WookieSenshi Time must not be money in your world.
Yes, because of drag squared.
@@dchawk81 Be in too much of a rush and sometimes you'll end up having a real bad day and out for months. Maybe even have your life changed forever. Also, on a 70 mile loop, going 55 instead of 70 take about an extra 18 minutes. Most people are just in a rush to get home so they can sit on their couch and watch tv until it's time to go to bed. Then they wake up and rush all over again. You have your preferences, and I have mine. I've learned that patience has a lot of value.
You'll also find the affect on MPG varies by which vehicle you put the tent on. A car like the Touareg will have more of a pronounced effect because the car itself has a relatively low drag coefficient. A car like say an old Defender, has the aerodynamics of a brick to begin with and will be relatively less affected.
great test. you should do a third test and put the equivalent amount of weight in the back and see how much effect weight alone has on fuel efficiency
Why? They already know that the weight is pretty much irrelevant on the highway.
Wait doesn’t matter that much. Particularly with the car that powerful 150 pounds will maybe be less than a percent
try comparing without roof bars
Agreed. I was told by a dealer that my roof bars resulted in a 10% worse fuel economy compared to no roof bars at all.
@@onlineo2263 that's more than I've expected.
I want roof bars in my future car. Is is complicated to take them on/off? It will be used sporadically and I would prefer to buy a smaller car and when needed use roof for storage.
Interesting, i put aero bars on to go on my trip out west in order to put a carrier on. Anyway when I got back my tires were totally shot so I purchased new tires, took the carrier off, yet left the bars on and towards the end of my trip my driveline developed a whine. Right now though I'm reading 26.7mpg on my trip meter reset after a recent oil change and usually I'm closer to 28.7 mpg. So I'm not totally sure what is causing the drop; aerobars, tires or driveline issue. Right now I"m going to get the driveline issue fixed first and see what happens after that is taken care of. Could be a total combination of everything. will try to get my MPG back to where it was though if I can. Tires can't do much about though. I may be pulling these aerobars off if they are taking away even 1 mpg.
The factory roof bars on the Touareg are meant to be pushed together and moved all the way to the back to act as a spoiler. In that position I doubt it would affect fuel economy.
I would not have thought 17% difference - wow. So if you drive 20,000 miles/year. Avg gas price of $2.50 you are spending $460 more per year on gas having a roof tent. Thanks for doing this guys, very informative. Did you notice any handling or buffeting issues with RTT? I just built out an adv. van and avoided putting a roof rack with glass solar panels on to avoid the drop in gas mileage. (I based my decision on a guess of about a 10% drop in gas mileage)
Did you notice any handling or buffeting issues with RTT?
...but if you're always staying in the tent vs. a hotel room, you save 10X that! ;-)
If you're not traveling, remove the tent.
-- BR
@@billredding2000obviously you would save by staying in a RRT in lieu to a room - i don't think that was argued or the reason why they did the conparo...
@@TerryManitoba Obviously, it wasn't why they did the video...but you miss my (joking) point.
-- BR
@@billredding2000 Yup - wasn't paying enough attention. I guess! I also didn't know you were the creator... t
Wow ouch! These tents are kinda becoming a thing right now too. I just put a carrier on for my trip on my Forester out West and yea the MPG decrease was totally apparent.
Are rooftop tents worth it? A 4 person stand up tent, two wide 400 lb cots, foam liners and ground cloth can be purchased for around $600. They take up about 12 cuft of space...and are readily removed and stored. Setup & breakdown takes 2 people about 30 minutes. In the lower 48 bear territory, a can of Comet, bear spray, and bear flash/bang, cost about $60. A dog or large bore camp gun are more expensive options.
It depends on your style of driving, and camping. I camp about 30+ nights a year. So it's worth it to me, because in less than 4 minutes I can have my entire tent, and sleeping set up. It's so convenient, and comfortable. Everyone is different though.
Buzz Pedrotti Yes but unless you spend 6x that and permanently mount your tent to your vehicle for daily driving, people won’t be able to notice your active lifestyle properly.
@@Jeepingshort Thanks. I'm a one week per year guy.
I am impressed you have a watch on... old school.
I mounted my roof top tent above the bed on my Frontier for this exact reason. It's actually double duty as a pseudo tonneau cover with the Yakima locks on the cross bars when in transit. It lives there all summer! Nice vid!
My 2008 v8 4.2 Touareg2 (newer FSI engine 350hp) is averaging about 15-16 MPG on highway with average speed 80mph. Got about 11 MPG towing 8000 pounds trailer from California to Texas (same avg speed - about 80mph). Always use 91 gas
I have a neighbor that drives year round with one of those Thule ski boxes on her Mercedes GLS, I wonder how much extra that’s costing her, not that she cares.
venom5809 at least ski boxes are aerodynamic, roof top tents are like a box haha
I can verify that! I have a Thule XL 613 Hyper roof top box on my VW Sportwagen and the Thule box is so aerodynamic that I only lose about 1-1.5 mpg at most. Currently with the box on I'm averaging 36mpg highway and 29 city, I have the manual transmission 1.8 Turbo.
What happened to Nathan's son, Mikey? Miss that guy
Steven McDonald Yes! #bringbacknathanssonmikey
And also Nathan he no more makes vidoes on this channel
He’s in California
Good journalism here
Car would likely produce more peak horsepower if 91 Octane were used but it would likely not have any affect on this test. The higher Octane fuel allows the computer to advance the timing for increased peak power. However all modern engines operate in a closed loop so it would have little if any affect on anything but peak power at wide open throttle. Actually a 17% reduction in efficiency is far less than I expected. For that matter around 20 MPG for this vehicle is pretty spectacular. Nice video and keep up the good work.
I should have added a caveat to what I posted. The test results I found do not apply to every vehicle out there. There are a LOT of mechanical items that effect ignition timing that can be ran on a certain motor without knock being seen by the ECM. Valve overlap, EGR design and programming, air/fuel ratio, combustion chamber design, and even spark plugs all play a roll in how much timing advance a motor can run on 87 octane fuel without seeing knock. The cleanliness and age of a motor also play a roll. With all of that being said, an engine will give better fuel economy on the lowest octane fuel that can be run in it without seeing knock.
Here is a link to more info on my testing including how much of an increase in fuel economy I saw when running 93 octane on that 2006 Chevy Colorado.
www.coloradofans.com/threads/i-will-never-again-run-87-octane-gas.91888/
@@91CavGT5 fair enough. I have also done some testing with premium fuel vs standard on many cars that recommend the premium fuel. In day to day driving I found no real statistically meaningful differences in fuel economy. Bear in mind these were not carefully controlled scientific tests but real world tests. Depending on the parameters of the ECU it is feasible that there could be an increase in fuel economy based on Octane of the fuel used. However I personally have been unable to demonstrate any such advantage. I did notice on some occasions smoother idling and what seemed to be a bit more responsiveness but those could have been placebo affects as I did not measure anything scientifically. I feel pretty comfortable in stating that the use of 87 Octane in this case probably had little if any affect on the results. Bottom line is that I would in fact always suggest that the manufacturer recommendations be followed. They have engineered the complete system and I would not second guess their engineering. I would always factor in the higher fuel price when considering a vehicle that recommends premium fuel.
You should always want to maximize efficiency. Better for the vehicle and the environment.
Keep in mind on these short tests your measurement uncertainty may be up to 7 % between runs if the variation between fillups is 0.2 g (+/- 0.1 g). Still a useful test. But instead of stating "exactly", you might consider the words "approximately" or "around".
Yeah, and please do account for wind, how many vehicles passed you or were near you and that pesky human driver who sure didn't push that pedal exactly the same way for those 66 miles. We're not talking rocket science here, we're talking a real life test and the variation in when that gas pump shuts off will cause a significant error to begin with.
@@uweschroeder Agreed. Another reason they should state "approximately" rather than their preferred "exactly".
@@buzzpedrotti5401 Actually that wasn't my point - poor communications on my part. My point was that it's imprecise to begin with. Yes, calculating to 3 digits is a bit of overkill but everyone watching these videos should be able to consider that it's one specific scenario which just generally translates to a similar scenario. Or to put it simply: if you leave a freaking big tent on your roof your gas mileage will suffer considerably.
@@uweschroeder My point was and is a bit different. Their language - "exactly" - is imprecise.
I see some comments on the weight hurting mileage, but steady state on a flat highway at 75 mph, weight means almost nothing compared to aerodynamics. Put that tent on a rear hitch carrier, shape it to fill the wake like a khamback, and you might actually improve the MPG.
That was very informative since I'm planning on buying a rooftop tent. I'm curious how it will affect my milage since I'll be mounting mine on a pickup just above the bed.
I have mine mounted over the bed of a Tacoma and don’t notice a mpg difference with or without the tent. I’d never want to mount one over the roofline.
Probably not much, if any.
That's where I'd put mine, so the cab causes the airflow to go up and over the tent vs. hitting it directly.
-- BR
yea some of use are men and bought a pickup to put things in it, not to have a glorified SUV
I drive a Hyundai Elantra that normally gets 34-35 mpg on mostly highway driving. When I go camping I put on a cargo basket and load up my camp stove, and a few large plastic storage containers that hold most of my gear. I figure the aerodynamics are similar to a roof top tent. I'll get 29-30 mpg when I'm loaded up so I'm dropping around 15-18%. This test just shows more of the same and wasn't surprising at all. Aerodynamics are a big player in your fuel economy.
Good review. You convinced me. Stick to a couple of backpacks for the adventure and the simplicity!
I just ran my 2018 Raptor to Colorado and back to Texas with and without a hard shell rooftop tent (iKamper). My loss was only about 1.5mpg. It was 15.5 vs 17 mpg without tent. I thought that was pretty great. The key was to have a wind flair....which I custom built. In addition to mpg the the wind flair saved me a great deal of howling and wind sound.
I bought an inflatable mattress that is made for the back of my JKU, it’s like sleeping in a small warm house back there. RTT’s are great until you have to pack it all up and go wheel for the day.
FYI, the only time the roof bars whistle on my V10 Treg is when either the bars have been mounted backwards, or the plastic/rubber "cushoning "strip is not fully seated.......
Great job. Good, clear test, and well expressed results.
At 80 mph, I get 52 on the Malibu Hybrid without anything on the bike racks. It drops to 39 with 3 bikes, 3 adults, and lunch for all in the trunk. So quite a big drop off if your car is already efficient.
I used about 25% more then usual on a trip one way. 100 km distance one way it was and had 400km range in fuel tank. When I got home I had just over 100km in fuel tank. But I was speeding along expressway
I figured it would be right around 19 mpg and I was close but without the tent 22mpg is not bad at all
Love the real world tests. It is worthwhile to note that the mpg measurement that we use in the US is not linear. Taking this into consideration the roof tent uses 20.59% more fuel. Pretty big deal.
That is quite a difference, however the tent is not "aerodinamic" cargo box, it would very nice to check how a more streamlined roof cargo box, like Skyline or Thule would affect the the numbers.
Wow. That's quite a bit more than I would have expected. I was expecting maybe 1mpg....
Great experiment. I believe better aerodynamic shape of the tent will improve the fuel economy.
Where’s the gas cap at 8:03 when u opened the gas door lol
Test if the roof rack alone hurts MPG at 70mph vs no roof rack at all. I read many people saying that roof racks add considerable wind noise at highway speed. If they are making noise, I think they are causing drag, which would hurt MPG. Just not sure how much.
I'm so impressed with that Touareg. I don't think I could bring myself to actually own a VAGmobile after Dieselgate, but the vehicle seems awesome.
Music vs voice transitions were a lot better on this video. Thanks! It makes it enjoyable to continue watching the videos. 👍
If the sticker says 91 then use 91.
Octane is taken into account with timing and afr. If you run a lower octane then you’re altering the timing of your engine and the afr will likely be too lean to prevent preignition events.
Run what they recommend.
If AFR is air fuel ratio the computer adjusts it automatically. It's OK to use lower octane. All you loose is a few percent power at full throttle. Let the war begin !
Lee Oldershaw afr is determined by engineers based of many factors including the octane rating.
Lower octane rating requires richer fuel mixture to prevent preiginition events.
Some vehicles can test ethanol % and adjust afr, but vehicles typically will just reduce timing with preignition events to prevent damage. Which means you’ll have worse fuel economy and performance and the possibility of building up excessive heat within the cooling system.
Newer vehicles use octane adjust ratios that can alter afr and timing when knock sensors tell the computer that the engine is seeing too many preignition events.
The computer will still try and feed back in timing and “sense” the octane rating, but long term use means more occurrence of preignition events and higher likelihood of damage.
Yes this confirms my experience. I’ve had a Roofnest on and off my car for the last year. I haven’t studied it but my mileage seems to go down even more, I’d guess 20-25%, and that’s just with local driving. Tent weight is #150 on an Outback.
But what if you put it over a truck bed? Theoretically it could improve the aerodynamics and thus mpg...
Thank you so much for your dedicated effort. It gives one an excellent perspective of one's options if you plan an extended country tour. (Over a thousand kilometers I can save R360 or R1800 over 5000kms). I am considering to convert my RAV into a camper and consider all the options in order to make it as economical as possible. (PS, I hate towing especially in off road environments). As accommodation is very expensive and a separate tent can be extremely inconvenient for one night in foul weather, sleeping in the car might proof to be a solution if one can design an effective system.
You might also consider slowing down when you've got a rooftop tent on. Aerodynamic resistance increases as the square of the speed. To give you an idea of how much more work the car has to do at 70 mph than a more leisurely speed, let's take a look at these speeds squared:
45^2 = 2025
50^2 = 2500
55^2 = 3025
60^2 = 3600
65^2 = 4225
70^2 = 4900
75^2 = 5625
So we see, then, that traveling at 70 mph is going to put nearly twice as much aerodynamic resistance on the vehicle as when you're only going 50 mph. Even slowing down by only 10 mph from 70 mph to 60 mph is going to cut the aerodynamic drag by just over 1/4 (26.53%). You're on vacation, slow down and enjoy the scenery!
I was not surprised at the mpg hit for the roof tent. I was figuring about a 4 mpg or 25% hit on economy at the start of the video. It actually did better overall than I expected. Please repeat that test with the same tent installed on the Model X and Ram Rebel. Those would be some good real numbers to add. I bet the Tesla takes a much bigger hit and the Rebel a little less.
I agree with some other commenters on here, a lot of us use RTTs over the bed of our truck. Mine for example sits pretty flush with the roof. So I think you should do this with a pick up too. Great test though
What would be cool is if they did one with a truck. having it behind the cab with a low profile rack making the top of the tent same highet or close to, as the roof. this is only for people that have the tent above the roof.
Do the same pulling the trailer y’all tried behind the model x. Be interesting to see mpg difference verse watt per mile(??) difference suv to suv.
Chances are the mileage drop is not that much. On my jeep (wrangler - essentially a brick when it comes to aerodynamics) a very similar trailer reduces my mpg by under 2mpg over a thousand miles. A trailer like that is not that tall, it most likely rides in the wake of the vehicle. I would say you lose no more than 2mpg towing that trailer while the X model halfs it's range. It's inherent to electric vehicles: fossil fuels have a much higher energy density than electricity stored in a chemical battery and they're much more aerodynamic in design so a trailer has a bigger impact in range.
Uwe Schroeder I tow a 6x10 motorcycle trailer behind a Silverado and lose 10.
@@rye811 Is it really that much? If I lost 10 mpgs towing I could as well park at a gas station. I'm normally around 16mpg on average and go down to maybe 12 towing depending on terrain, wind etc. Going on a mostly level trip I almost don't notice the trailer - it is more aerodynamic than my jeep though and weighs only a little over 1000lbs.
@@uweschroeder yeah i usually get 21-22ish on the highway. when i tow my trailer its 11-13.
A very good presentation. Just enough math and detail to demonstrate the effect that frontal area has on fuel consumption. No real surprises here--you gotta push that air out of the way, don't you! But you do want to sleep all covered and cozy!
For comparison in Sept 20, in the UK, I’m paying $7.70 per gallon for diesel. 😔😐
Great video 👍
I hoped you searched the other pumps for your gas cap. Them is expensive from VW. LOL. Great vid, Thank You from Australia.
Hey! Thank you for the review. But I'd like to ask which GPS app did you use during the review?
Fatih Dinç it’s called Waze. It will report hidden Police vehicle too.
Thank you for the reply 😊
Thanks for doing this! I keep seeing these roof tents and I've been thinking they pobably kill the MPG. While travelled to college (way back in the day) I loaded my roof with a couple suitcases and my tahoe wouldn't even shift into overdirve on the freeway! I had to leave some of my stuff in a local dumpster to contunue my trip.
I was pretty shocked first time I used a roof basket on my truck. It is the single worst mod for mpg. Lift kit or tires don't even come close.
Better than I expected ...
The loss of fuel mileage applies to almost any vehicle when carrying stuff on the roof, including those roof rack cross bars,...in fact the roof bars in any direction will effect your fuel economy.
According to this test, my buddy's Touareg should get considerably better fuel economy than this as he's running 'normal' tires plus our speed limit is set to a max. of 100 kmh ( approx. 62 mph)
and does not have a roof carrier at all.
Good test though.
Y'all should do the Tundra before and after MPG with the snorkel. I added a snorkel on my little SUV and it surprised me the mpg didn't really change.
I actually removed the crossbars from my rig and I'm not putting a rack up there until i need it. It hurts center of gravity too. Its also important to me because I have to drive signifigant distance to my destination.
OMG that giant Touareg gets better MPG then my Honda CRV that has only 1 size bigger then stock Geolandars.
Not surprised at all. Modern cars, even SUV styles, are pretty aerodynamic these days. Putting a large square box, about the most UN-aerodynamic thing out there, on the top is going to screw with that more than a little.
Very learnful test! Thanks! I was wondering what will be the difference with a cargo box on my Q5 this Winter... It gives me a good idea...
Curious why you went against the factory specification of using 91 octane
The new guys is great! Nice job man, keep rocking.
There is a reason trucks 18 wheelers, put those big wind deflectors on a their roofs. Why Tesla has a curtain closed trailer thing. You need to streamline everything. This is the same reason buses and RV have such terrible MPG. (2.75-5.5 for city buses & 4-7 for RV's). Stream line or add a wing and you fix much of the wall of air.
I wonder how bad a clamshell tent compares to this.
Awesome! I bought a 2019 Subaru Outback and installed a rooftop tent with the soft cover, not the hard shell one.
Interestingly, my tire pressure light came on so I filled the tire with what it should be on the factory tire based on the list instead the door. I keep the monitor on and notice the psi fluctuates.
What is y'alls take on tires with a Rooftop tent? I did not add a rack I am using the crossbars.
I searched for this video in 2022 because I'm wondering if I should take the roof basket off of my car. It looks pretty cool, but my car is so underpowered as it is. Maybe it would perform better without the extra wind resistance and weight. I have it on my 03 Honda CRV.
Great review Alex..nice job..Thanks for bringing out the car..
17%.. Would a small/teardrop trailer (1,000pds+/-) get better mpg's? I need to know.
He got the specs wrong in regards to HP and torque on the 2004 v8 Touareg. It's 310hp and 302lb/ft of torque. I was just curious because I have a 2006 Cayenne S that came stock with 340hp and 310 lb/ft of torque, and was like hmmmm, VW was more powerful than Porsche????
It was a great review though, especially as those tents seem to be getting more and more popular.
Yep, he got his specs from the newer v8 that was in the 07 I believe. Maybe the 08, can't remember for sure.
Is that not bad for the engine to put 87 when vw recommended 91
You have a net lower compression at altitude than sea level. Hence, you also reduce the need for octane.
They should use 91, as the engine has to adapt to lower octane and should get worse fuel economy, thats another test, they can still damage the engine...
@@lotsad1234 was thinking there silly if the car is older there not putting 91 in it when a car older that's when you need to put 91 in it because of all the carbon
Old cars lose compression - it's rare they gain it with mileage. Maybe if it had bad valve guide seals for 200K. If you guys want to waste your money, go ahead, but unless you can hear it detonating or knocking, its fine at altitude to use lower octane fuel - ask any mechanic in Denver.
@@treborheminway1196 I never knew that
Still better mpg than my V8 Jeep Commander.
Still better than my Lexus GX too
I don't know how he got numbers that high. I've got an 05 V8 touareg and am lucky to get 16 mpg highway and 12 city.
Maybe being here in the Pittsburgh Pennsylvania area and the difference in altitude as well as the humidity here makes a difference?
Could also have something to do with our gas here also possibly?
don198769 terrain, road surface and the amount of booze in the gas all contribute to the fuel economy difference.
@@infidel24 That's more what I'd expect as well, and in line with my Commander. 16 Hwy/11 City. Though mine is less aerodynamic than a Touareg.
Just think how much you save on hotel costs, or pulling around a travel trailer with a truck. Worth the difference in MPG.
How about the wind on the day(s) the tests were done? If there was a crosswind for one and none for the other, that can be a huge difference in MPG. I didn't see the wind mentioned.
Scary to consider my $9000, 125k mile, 2008 Highlander got:
27.5 mpg at 65 mph for hours.
26 mpg at continuous 72 mph.
At well above 75mph it still got 24.4 mpg continuous for hours ...must have been the driving "downhill" from VA to FL.
The follow up possibilities could give you multiple content videos to make. Endless...you have the vision
Good job! I am surprised it made that big a difference. Very interesting.
I would like to see you guys try the General Grabber at2 tires they are great. I got a set put on over a month ago and I have been nothing but very impressed by them they are great and very affordable.
You'll have to check the forums, but if you were hearing whistling from just the roof rack, I think you may have them installed backwards.
Nice that you figured in the tires!
Now hook up a small travel trailer to it and see what it gets!
they need to come with more aerodynamic designs for roof top tents
THe carriers are probably a little bit better since they do have the slope in the front. Going to be some loss, but I would think less than a square faced tent.
Trilha Sem Fim they exist. You just have to shop around. They are more expensive though.
I have a rooftop tent.. but I built my own rack so it sits lower than the roof of my pickup... 😉
It would be interesting to see the difference according to the vehicle mpg computer...
The roof top tent manufacturers need to think about some sloping aerodynamic front to help It would not take much to implement. May be TFL can make something like it to test the difference and then if it does make the product and sell it
Awesome review and reviewer.
That was better mpg than thought it would be before the tent and after installing the tent. You should really take everything off the roof for daily driving for best mpg.
That's what I don't get. I see these Overlander cars in the fast lane going 75 mph with those pop up tents. Aren't you suppose to be taking it slow??
This reminds me of seeing a Prius driving on interstate with a complete roof rack system, but not carrying any cargo.
That's not that bad, actually. We lost 10 mpg on our Tucson driving with a soft travel bag on the roof. We normally average about 31 mpgs around the Durango area and with the bag we got 20-22, depending on how windy it was.
Great information to have and a good video to boot.
I would love for this same test to be done with a roof basket on top of the vehicle. No basket versus an empty basket versus a basket with "stuff" in it.
I've got the Yakima Skyrise 3 on my Colorado...I think my hit is even worse...maybe 5-6 mpg. I love the thing, but I'm looking into pulley systems to make it easy on/off.
thanks for that info also can you do one test with off-road camper trailer im curious
if there is much difference
the weight of the car also makes a difference. the impact of a roof top tent on a big suv is much less than on a small sedan.
Good information, well done!
8:50. All you need to know.
The video is not even 18min long
@@PasleyAviationPhotography SORRY 8:50
When they were doing the towing test with the model X I mentioned about a friend who left his roofbox on all the time even after his holiday was well over now the modern roofbox is pretty aerodynamic but it was eating the fuel which he found after I nagged him to remove it, and he was glad he did as over a month he saved the equivalent of three quarters of a tank of petrol on his work commute, now it would be interesting to see if a deisel vehicle was effected as much unfortunately i am running petrol now as last year I swapped my deisel to a petrol vehicle a marmite car if you kow what I mean.
Very interesting. In my jeep I only saw a 1.5 to 2 mpg difference. Maybe the fact that the jeep is not as aerodynamic to start with, it doesn't get hurt as much......
So would 91 break the bank or y'all just think you know better than Volkswagen ?
yea they know better than volkswagen as does volkswagen themselves. 91 is rated for sea level, they are far from that. the higher you go the less octane you need.
I did not know that going higher reduces the octane need. Is that the same for turbocharged or supercharged engines (which I believe pretty much make up for the thinner air by spinning faster)?
Carroll Shelby - makes sense. Thanks for the clarification.
FYI: Get yourself a V10 TDi. I get no worse than 15mpg towing up to 8000lbs. Oops did I say that out loud;)