Contrary to numerous studies showing economic and consumer detriment of fuel with more than 10 percent ethanol, EPA approved a plan submitted by the ethanol industry to address residual fuel that may be left in gas pumps that offer both E15, or gasoline blended with 15 percent ethanol, and other fuels. That step "knocks down the lone, significant regulatory hurdle standing in the way of getting E15 into the marketplace," trade groups Growth Energy and Renewable Fuels Association said.