Oops...Mary, sorry but you are talking about the "Ol Perpetual Motion Machine". Wind generator on your car-- it isn't that easy. the Engineers and Physicists will be on you talking anbout entropy and enthalpy and the Second Law of Thermodynamics until you are blue in the face.

Its better to think about burning fatty oils in your diesel bus. The fellows who actually do this take the oil home and clean it up- you really have to get the Freedom Fries bits, chicken beaks and claws out of it first.