[Johnny Mullet]

I agree with the aerodynamics. The under belly tray is also a good idea. Fender skirts for the win!

All new cars should have instant built in MPG units (like higher line models do now) and like Ford did it years ago on a truck, they should have an optional vacuum gauge with a red/green zone.

Tire pressure monitors really suck, but they do let a driver know of an inflation problem. This is already required by law for new cars anyway, but a monitor that tells you the air pressure in each tire would be great!

Forget the honkin' 16"-22" rims and wide tires! Lets bring back the skinny tire! I'm not talking about Metro wheels on an SUV, but a tire and rim size proportioned to the vehicle.

Optional switches or programmable system that allow the driver to turn the A/C compressor on or off and other accessories like Daytime Running Lights, autolocks, entry illumination, "sealt belt minder", etc as desired. Cars being sold to the general public cannot have a "kill switch", "Alternator cutout", etc because the general public are stupid.

I would also love to see the return of the diesel here in America.