FUEL playthrough - The ashtray's "Endurance" challenge

How I select cars for this playthrough:
- I play only with unlocked cars, and from which I choose the “fastest” one, with few exceptions
- If I don’t have any car unlocked for a career race, then I look at the challenges. If one car from which I could choose to unlock needs to be used in a zone’s challenge, then I unlock that one
- I unlock challenge needed cars only after I finish the career races from that zone, the only exception being the above one
In this playthrough I also try to minimize the “unofficial” shortcuts, unless really necessary (for example, in races where I have vehicles which are too slow to win with normally).