Retrofit for E85. Many of the GM motor vehicles andsome Fords are now being manufactured as Flex Fuel Vehicles (FFV) that can run on E85 (ethanol/gasoline mix) efficiently and without damaging the engine and fuel lines. The question is whether there is a retrofit solution for the rest of us. For perhaps an answer, check here and here and, for a negative view on retrofitting here (down the page a bit).
Look at the question this way: For every dollar I spend on gasoline, a piece of that dollar goes to Hezbolla and Al-Queda, to Iran and to Venezuela. We must do something about the problem.