Abstract: The invention provides an Air Foil for Vehicles, is a specially designed cover for the backs of pickup trucks and trailers that provides them an aerodynamic quality and provides lift reducing their effective weight as they travel in a forward direction. The invention is a self contained system that reduces energy needed to power a motor vehicle without requiring an excess use of fossil fuels. The Air Foil for Vehicles applies an auto wing mobile airfoil configuration to the bed of a pickup truck and the open area of a trailer to lift the back ends off the road and facilitate a smoother ride and better miles per gallon.