I think we need a Gears mod and a Gas mod, for gears you switch gears and if you dont switch and like stay in first gear you'll go slower but if you go as fast as you can in first or any other gear your vehicle will break. and for gas mod, there is a gas station block and when a vehicle gets near it it regains gas fast and you can make it cost blocks. also after time youll lose gas slowly.
Thars my idea.