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You need a tune, I am going with the OFT method myself, without a flex fuel kit.. its more of a pain to switch though, and not for the feint of heart if you are worried about flashing your car every time you want to switch fuel types.
That said, I like E85 NA very much, and I actually save a little money on overall fuel costs vs 93 in ATl GA. I do go to the station every 150~200 or so miles though now. I don't like letting my car get below 1/4 tank.
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