According to the EPA, the petitioners' primary interests are to increase ethanol use and protect or improve their competitive position, which it maintains is not an acceptable basis for challenging the Tier 3 emissions standard for cars and gasoline.The Energy Future Coalition and others argue that the EPA's so-called Tier 3 emissions standard for cars and gasoline, which is designed to cut sulfur levels by more than 60 percent starting in 2017, contains a provision that prevents gasoline producers from creating new fuel blends containing more ethanol. At issue is whether the EPA will allow auto manufacturers to use test fuel that is not currently on the market including a gasoline blend that is 30 percent ethanol. The commonly used test fu...