Ethanol is a clean-burning, high-octane fuel that is produced from renewable sources. At its most basic, ethanol is grain alcohol, produced from crops such as corn. Because it is domestically produced, ethanol helps reduce America's dependence upon foreign sources of energy.
Pure, 100% ethanol is not generally used as a motor fuel; instead, a percentage of ethanol is combined with unleaded gasoline. This is beneficial because the ethanol:
* decreases the fuel's cost
* increases the fuel's octane rating
* decreases gasoline's harmful emissions
Any amount of ethanol can be combined with gasoline, but the most common blends are E10 (10%) and E85 (85%)