E15 is a new fuel blend of up to 15 percent ethanol by volume and 85 percent gasoline that the federal Environmental Protection Agency has approved for use in 2001-and-newer automobiles, light trucks and medium-duty passenger vehicles. The blend isn’t approved for use in motorcycles, all-terrain vehicles, boats, lawn mowers and other engines at this time. Before the EPA approves it for use in bikes and ATVs, the American Motorcyclist Association wants proof in the form of an independent study that states E15 won’t damage motorcycles and ATVs.