The Environmental Protection Agency (EPA) today approved the use of ethanol blends of up to 15% in gasoline (E15). This partial waiver of the Clean Air Act clears E15 for use in all model year 2007 or newer cars, light trucks, and medium-duty passenger vehicles. E15 is not approved for use in other types of vehicles and the EPA is deferring an approval decision for E15 use in vehicles older than model year 2007.
Additional details and a FAQ are available at the EPA website: http://www.epa.gov/otaq/regs/fuels/additive/e15/#use