i know the sunshine stores do not have it. flood/gray and porter near the sonic/hospital. Also the Sinclare off main, near Hastings does not, and they are cheaper than most. Another one is Mr. quick...
All I've seen is just Valero, you can go to their website and look up locations.
The closest one to me (in NW OKC) is Expressway and Wilshire (by City Bites)
Edit: Any of the independent stations...
Due to state and federal government tax breaks it is almost impossible to find gas with out ethanol added. Your best bet would be to call your local stations, ask for a manager and ask them what the...