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Octane rules. I'd rather use 93 octane with 10% enthanol than 91 octane pure gas.
To MonneyPit, until you've tested the fuel, you have no clue as to the alcohol level. I bought a test kit last year, and saw all kinds of crazy. I trust nobody as to "pure gas" claims. Testing octane, is much-much harder and very $$$$. So I just trust the retialer to be ethical, and only buy from major national chains (Mobil, BP and Shell).
As a side note, when I was testing my fuel for alcohol content, most was in the 5% range. All were below 10%. Very common to 8-9%. Which makes sense because of the cost of alcohol and they need to meet the claim at the pump for being "no more than 10%". So, I assume the shoot for 8-9% as not to exceed the 10%.
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