Airpanes do it.......
 

I know this sounds ridiculous-ish but you know how people but spoilers on their trunk to make the wind push them down for more traction, if that works, couldnt you put one on backwards and have the air pull your car up, falsely removing weight, kinda like people in those air tunnels, the are is pushing you up so fast you float up (like being 200 pounds less)

Look at my ridiculous picture if you want an idea of what im thinking like:
http://ecomodder.com/forum/attachmen...1&d=1284098482

you could absolutely create lift, but with lift comes drag. The short answer is, it wouldn't help.

1. By creating lift you may lose traction. Good for slightly reducing rolling resistance, but horrible if you actually want control over the car.
2. You reduce weight, but not mass. Mass is what you have to haul up every hill, and what you have to pull each time you accelerate.And what tries to pull you out of the road when turning without enough traction (b/c you have too much lift, for example).
3. There are ways to create lift without a big ol' spoiler sitting in the airstream. For example certain rear hatch and rear diffuser angles will increase lift (Cz on the drawings below), but usually at the cost of increasing drag (Cx).

http://ecomodder.com/forum/member-pi...ck-vehicle.jpg

http://ecomodder.com/forum/member-pi...r-diffusor.jpg

It looks like a great scheme, but in aeronautical engineering they have something called lift induced drag.
Basicly if you want to exploit the lift of a wing, you'll have to live with its drag as well.


But airplanes are often hypermiling, with flight crew incentives to do so.

Reducing fresh air to the cabine is like switching the car's AC off.
If you're getting a headache aboard, this is often why.

Changes in traffic control have the effect of coasting.
Rather than having approaching aircraft fly stepped approaches where they repeatedly descent and level out in horizontal flight (using fuel and causing noise), ATC improvements are now allowing for continuous descent approaches - "engine on coasting" down to the runway.

Any wing that fits on a highway will be less efficient at supporting weight than wheels.

That would be very dangerous at highway speeds. The mass doesn't go anywhere, and you'd be losing traction.

There is another way to reduce weight on the wheels, drive it off a cliff. It is about as advisable.