E85 - 85% ethanol and 15% unleaded gasoline
E85 is an alternative fuel for use in flexible fuel vehicles (FFVs). There are currently more than 6 million FFVs on America's roads today, and automakers are rolling out more each year. In conjunction with more flexible fuel vehicles, more E85 pumps are being installed across the country. When E85 is not avaialble, these FFVs can operate on straight gasoline or any ethanol blend up to 85%.
It is important to note that it does not take a special vehicle to run on "ethanol". All vehicles are "ethanol vehicles" and can use up to 10% ethanol with no modifications to the engine. Often people confuse E85 for "ethanol", believing incorrectly that not all vehicles are ethanol-compatible.
Source: http://www.ethanol.org/index.php?id=34&parentid=8