The Environmental Protection Agency (EPA) contends that its proposal to sharply reduce the 2014 requirement for ethanol use in the Renewable Fuels Standard (RFS) was driv­­en by the lack of infrastructure in the nation’s fuel supply system. The ag­­ency said the reductions were inevitable because it is too difficult to go beyond a 10 percent blend of ethanol in the U.S. gasoline total, the so-called blend wall.

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