Arizona has E10 gasoline. There is no E15 gas available right now in the US unless it is the bath tub variety. The EPA approved E15 for Tier 2 vehicles only. Tier 2 vehicles started being produced depending on manufacturer around 2003-05. The Autos, boaters, small engine manufacturers,
oil companies and anyone else with a brain that isn't drinking corn ethanol is against it. The ethanol producers like ADM somehow have a stronger lobby than the other guys combined and have bought off, excuse me, lobbied our government to require ethanol. We are headed to E15 soon enough given the laws that are on the books already.