So what is E85 fuel?

• Eighty-five percent ethyl alcohol (ethanol), 15 percent automotive gas.
• Blends turn more to petroleum in winter months (E70, which has 30 percent gasoline).
• Today's supplies are made from corn.
• Cellulosic ethanol is a future supply source, and it can be made from fast-growing trees, corn stover, grain straw, switchgrass, forest products, waste, and construction waste.
• Although a high-profile study by a Cornell University professor claims ethanol production requires more energy than it produces, government and industry supporters of ethanol production say ethanol is energy efficient, yielding almost 25 percent more energy than is used in growing the corn, harvesting it and distilling it into ethanol.
• A vehicle uses up to 1.4 times as much E85 than gasoline to go the same distance, so price is an important factor in E85 marketing.

Source: U.S. Department of Energy