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There are stations that sell cheapo gas, the best way here in WI to account for FE differences is tank to tank varience. After tank to tank variance you will notice if you do the alcohol percentage test that certain stations sell 87 octain fuel that is the full 10% ethanol mixed with 83 octain crap gas, other stations only have a few percent ethanol and mix with 85/86 octain fuel. You will find that there is a difference in fuel economy because the physical composition of the fuel is different, also understand vehicle tune has a lot to do with this.
A few years ago the ethanol station sold true blue E10 mixed with real 87 gas for 89 octain, my car seemed to get better FE on this than Kwiq trip crap gas 87 octain but the difference was only a few percentage points over the long run, sadly the ethanol station sold out and now also sells crap gas.
Ah well
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