Alliance of Automobile Manufacturers v. EPA

Four industry groups sued EPA after it granted a waiver under the Clean Air Act allowing gasoline containing 15% ethanol (referred to as “E15”) to be used in model year 2001-06 cars and light trucks.  EPA approved E15 for use in model year 2001-06 cars and light trucks on January 26, 2011.  The previous limit on ethanol in gasoline had been 10%.  That limit still applies to vehicles older than model year 2001 due to concerns that the corrosive nature of ethanol would damage engines and emissions controls. However, testing by the Department of Energy has found that newer vehicles can use the fuel blend safely.