Calling itself the “world’s first portable, produce-where-you-consume, ethanol distiller,” the EFuel100 is an Easy Bake Oven of sorts. The EFuel100 Web site says:

Just add the EFuel100 Feedstock Mix (EFuel100-FM, sugar and yeast) to the unit and press START–set it and forget it. In about 5-7 days, a tank full of Ethanol100 is ready to pump into your vehicle, using the built-in 50-ft retractable fueling hose.

Source: Greentech Media and EFuel