Maybe I
want a car with Hail damage.
Myth busters had an episode there they added clay to a car so they could dimple it like a golf ball. First they added clay to the car and molded it like a regular car, then they dimpled it like a golf ball. Believe it or not it was 20% more fuel efficient then the car without the dimples. They even put the clay they dug out to make the dimples in the clay into the back seat so the car had the same weight.
Now hail damage isn't exactly the same effect as a golf ball dimpling, but if they made a car with dimples in the sheet metal all over the car that got 10% better gas mileage, I would buy it.