What gave you that impression, Zxern?
As for fuel, if it's true, I doubt that it's really much of a problem. Vehicles hardly last long in any GTA game anyway, and there's shitloads of other cars to use. One reason that the cars are so (ridiculously) fragile in the current GTA games is because they want to encourage people to try out all the game's vehicles rather than just keeping one for ages. Perhaps if they do this gas thing instead to achieve the same goal, they'll consider making the damage on the vehicles more realistic.