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All E85 pumps are labeled 70% ethanol minimum here, never tested it myself, just takes a calibrated cylinder and a some water but I don't care to. I'll trust the pump label.
My cars are maintained just fine, but I never have the same exact tires on them and at the same tread depth so mileage will vary year to year.
Unless you never wear tires out how can you test over years running one fuel this year, and a different fuel next year and expect accurate results.
Are your cars fuel injected or carbed? I could see carbs showing your losses in power mpg etc... more than a fuel injected ones.
I can run into the E40 range with my non-FFV cars and only symptom is reduced MPG/range. Actually think the Cobalt XFE picks up some HP, but the butt dyno isn't very accurate.
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