"The Environmental Protection Agency said on Friday that cars and light trucks from the 2001 model year onward can safely use a blend of 15 percent ethanol mixed with gasoline, up from the 10 percent standard now in effect in much of the country. The decision expands the pool of vehicles that could use such a fuel to about 62 percent of the total on the roads.
But the practical impact of the announcement on the fuel blend, known as E15, was not clear. An announcement in October that newer cars, from the 2007 model year and later, could use the blend has so far had little impact on retailers or drivers. A new fuel requires multiple approvals from many agencies. And retailers are typically not set up to offer an additional grade of gasoline at their pumps: if they wanted to sell E15, they would have to stop selling something else."
Matthew L. Wald reports for the New York Times January 21, 2011.