California regulators will consider proposed E15 regulations on Sept. 24 that are needed to fully implement state sales of gasoline mixed with 15% ethanol. Top ethanol trade groups Growth Energy and the Renewable Fuels Association praised the move by the California Air Resources Board. California last year became the last U.S. state to legalize E15, though sales have yet to begin. The proposed rule would set the technical standards necessary to get the fuel flowing, Growth Energy says. There's also been a regulatory hurdle blocking E15 sales involving an equipment requirement that ethanol organizations say is outdated.