i agree that testing the fuels is the only way to know for sure whether the pump literature is correct as to what you are getting.
i'll repeat that every state's renewable fuel mandate is and or can be different as to what fuels are mandated to have ethanol. Also just because a particular grade is exempt, does not mean it does not have ethanol in it( the individual jobber is left to decide whether he wants to mix ethanol in it or not).
the above is because our gub'ment enacted the standard but left it for every state to decide how they would meet the mandate, there fore the differences.
Now that having been said, i also keep good records on my mpg and try to go with the fuel that is returning my best mpg. Inevetibly i believe that even if you do pump E0, that there may be some E10 left in the hose or line from the previous user of the product.
on ediit: I'll say this again, the RFS is a convoluted mess, in more ways than one.