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On April 2, for the first time, the U.S. Environmental Protection Agency approved E15 —gasoline mixed with 15 percent ethanol—as a registered fuel. For more than 30 years, ethanol has been blended into gasoline, but the law limited it to 10 percent by volume for use in gasoline-fueled vehicles.
The primary source of ethanol is corn, but other grains or biomass sources also have been used as feedstocks. The announcement represents the most significant development in a three-year effort by the industry to secure approval of the sale of the mid-level ethanol blend, and it follows EPA's testing of the fuel for any negative health effects in February 2012.
The partial waiver will enable fuel and fuel additive manufacturers to sell gasoline that contains greater than 10 volume percent ethanol and no more than 15 volume percent ethanol (E15) for use in model year (MY) 2001 through 2006 light-duty motor vehicles (passenger cars, light-duty trucks, and medium-duty passenger vehicles). In October 2010, the EPA granted a partial waiver for E15 for use in MY2007 and newer light-duty motor vehicles, subject to the same conditions.
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