Sea Water, via high pressure reverse osmosis and cold fusion reactions. If you run out of sea water, you can piss in the tank.
+1, just drive through Iowa and see your wasted taxpayer money at work on all of the subsedized corn fields. I wish I could produce a product that doesnt make money on its own and have the government pay me so it does...Doa report on why using corn for ethanol production is just stupid and wasteful.
takes 4 gallons of fuel to make 5 gallons of ethanol, according to Willey Nelson who is Texas's largest producer of Biodesiel and previously ethanol. Cane sugar is best at 2-5 ratio and grass and other waste bio matter is the cheapest but has a 3.5-5 gallon ratio.