Now this just hit me and I figured it could increase in the realism for the game.

What if you could walk or hitchhike but it makes you very tired and weak making you more vulnerable to attack. now this could only be availible to people who are under made man, since they would be to important to do that stuff.

Or you could be able to highjack a car after a certain level and it either increases the chance to commit a crime and use it like a getaway car. or you could use it to travel a short distance for the price of gas. which say would be from NY to LA like 3K.

It sounds like an unnecessary complexity.. I liked the idea of the cars, as an owner that is.