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Turn back the clock to 2006, when Ford Motor Company announced it was taking flex-fuel vehicles seriously. That year, the company built 185,000 autos that could run on gasoline, ethanol or any combination of the two up to E85 (85 percent ethanol). Ford also pledged that the company's production of flex-fuel vehicles would double by 2010.

Converted plug-in Prius – Click above for high-res image gallery

If you're interested in putting ethanol in your car, you're probably wondering if E85 is right for you. The National Ethanol Vehicle Coalition has a list of E85-capable vehicles, but there are not a lot of vehicles on the list (most are recent trucks and a few sedans). For those willing to mess with their engine, Green Fuels is offering drivers in the U.K. the Fullflex Gold Bi-Fuel Manager, which "plugs into the vehicle's engine management unit while the other is attached to the injectors. Once