In Washington, Valero has followed suit by filing suit against the Environmental Protection Agency in the U.S. Court of Appeals saying the RFS unfairly favors some oil refiners while punishing others. In a separate filing, the company also sought the blending mandates for 2007 and 2010 be reopened and revisited. With the EPA using a “general waiver authority” to reduce blending volumes, the company believes the agency should have also tackled logistics challenges having to deal with structural impediments to blending.