Well, legally, you can request an MSDS on your fuel, and the company has to provide it, all though the station attendant probably can't. (Even though it's supposed to be on hand. AT ALL TIMES.)
Secondly - ALL publicly sold fuels in the US are REQUIRED as of 2008 to contain some measure of "renewable fuel content". Which was likely determined to be ethanol.
I suppose unless you can prove that your stations don't use Ethanol, I'm gonna have to call BS. From what I know, Ethanol is actually a requirement, not a choice.
Standard Program | Renewable Fuels | US EPA
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