The president of the Renewable Fuels Association (RFA), Eric Vaughn, says he is disappointed but not surprised by the Oxygenated Fuels Association's (OFA) federal court challenge to the state of California's two-year old phase-out of the toxic gasoline additive MTBE. Filed on 24 January in the state capital Sacramento, the OFA challenge is based on what the RFA calls “the groundless notion that by moving to protect its drinking water from further MTBE pollution, California violated the federal Clean Air Act”.