Add odometer to vehicles
Did you travel anywhere last night?

This may already exist in the game, but I think it would be really cool if vehicles had odometers. That way you could see how far you've traveled on a tank of gas, or you could see if someone went joyriding in your car when you weren't looking. Or you could boast about how far you've traveled. Potential forensic evidence, too.

If this is added, my stupid adventure to the ends of the badlands will happen.