B.S. Tune it. Yes, MPG drops, you get less energy from ethanol than you do from gasoline. However, with the cost difference, you'll more than make it up in current market. Cheaper, higher octane, less knock, more power. E85 is equivalent to race fuel if you tune properly. For half the cost.
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'99 GTP, L36 bottom, XP cam, Headers, 3.29 gears, FWI, Powrtuner