The average American family owns 2.28 cars, and even in genuinely car-dependent areas they could probably get away with one. How much does that excess auto capacity cost? Enough that if everyone ditched their unnecessary vehicles, they'd save an average of $186,425.03 over 30 years. In a lot of places, that's enough to buy another house. At very least, it's more than enough to move to a more expensive area that's more transit-accessible or requires a shorter commute.