I have lots of first hand experience with e85 in non e85 vehicles. Most of the ones i see are done accidentally or by people that dont know any better. I have been clear saying that if you keep the alcohol content low enough that your fuel trims are never maxed (that means, hot/cold, idle to wot and everywhere in between) it wont hurt a thing. I cant tell you how high the mix can be to not go over the threshold but considering you have fuel trims over 24 at wot yours is too high. Lower the percentage a bit more and see what happens. Just start adding a gallon of fuel to your tank at a time. Once your fuel trims are not maxing under any condition take a fuel sample to a dealer and get them to test it for you. Then you will know the exact alcohol percent you can safely use. If you live close to the desmoines iowa area i would test it for you.
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