Reuters: With two words, the U.S. environment regulator may be handing oil refiners the biggest win of a long battle to beat back the seemingly inexorable rise of ethanol fuel. In a leaked proposal that would significantly scale back biofuel blending requirements next year, the U.S. Environmental Protection Agency (EPA) says the blend wall - the 10 percent threshold of ethanol-mixed gasoline that is at the crux of the lobbying war - is an "important reality". The agency's rationale for a cut in the volume...