E10 is government mandated in my area as well, but Shell and Citgo premium is still 100% gas... albeit at a 30% markup. I've since found a family-owned Lucas Oil place with 87 octane 100% gas for only 20 cents more per gallon. Considering you get about 10% better fuel economy with it, I consider it about a wash even before considering it's better for your car. Only other place I trust fueling up other than that is Mobil and Shell. I'll randomly trip my check engine light with an oxygen sensor warning if I fill up at other places.