FYI
Here is a link to gasoline stations in the U.S. and Canada that sells gasoline without ethanol. Listed by state, by city. Includes Brand, Octane, Street Address and GPS Cor.
http://pure-gas.org/index.jsp
It seems that cities or population areas below approximately 275K are not mandated to include ethanol in gasoline. There were no large metropolitan areas in Texas that listed ethanol free stations.
Note: 91 octane was listed by many stations as ethanol free. However, their lower/higher ocatne gasoline may contain it.