I just bought a 2007 Dodge Charger. I know not the typical car here. For good mileage I will drive my Scooter or CRX.
Here are a few things I found intersting on the Charger. It has a belly pan under the motor. There is also small lip seals on the front doors to help eliminate the seams. It a coefficient of drag of .33
http://en.wikipedia.org/wiki/Automob...g_coefficients
So they tried to clean up the aerodynamics then just overpowered it so it still gets crapy meilage
http://www.fueleconomy.gov/feg/2008c...umn=1&id=23609