In my opinion, all fuel tanks should be slightly lowered and fuel economy more balanced. Most standard cars/vans/pick-ups in real life only have a 18-25gal fuel tank, which is about 68-95L. Understandably, fuel economy isn't exactly representative in SAES; this means, I believe, that the value(s) used to determine how many litres per kilometer an hour isn't factual to engine load but to distance traveled. In the delivery man case, perhaps a feature could be added as whoever is spawned as delivery man and is using one of the company vehicles while on a route will not have to pay for fuel out of their own pocket.