What about a slip-over lightweight body??

[molinee]

I just recently found this forum and find it pretty interesting. Seems like a lot of brainstorming with not a lot of ridicule.... So here goes... What about a lighweight plastic/something sleeve body that is made to slip over a specific model and locks/bolts into place. Aerodynamic fuel savings. If you don't want the full body suit how about a mini-version that fits over just the front/grill/hood. Is there much mileage to be saved by using something like this in the city or one the highway? .... If it would work of course. So you can dress up your Ford Focus like a missile. Or have I entered into the Bizzaro World? I guess I don't have a good feel for increased mileage for this sort of setup if it were practical.