Well it's pretty easy for me, I can smell it when I gas up, Doesn't even smell like gas LOLI'll challenge anyone here in the state of NC to provide proof (of these NC stations listed) that their gas does not contain ethanol.
After having a lengthy conversation with a friend and owner of a local oil company who distributes gas to several stations in the area I was left heart broken. His advice was to test the gas out of a can with a test kit before you assume the station is telling you the truth.
Marina operators/owners are also sometimes mis-informed as to what thay are getting. For instance, I asked a local marina owner if his gas was ethanol free and his comment was "Absolutely! I only sell 93 octane."
I assumed he had been told that 93 was ethanol free.