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That was 15-years ago, many new developments have occurred since that time. E85 is the current champion fuel with 105 pump octane rating. This allows for high-compression streetable engines that would've been temperamental monsters just couple decades ago. Or extremely high boosted (20psi+) engines.
Due to difference in specific-gravity, you can't just replace gasoline with E85 and expect more power. AFR will also be too lean due to diffence in stoichiometric ratio. So you'll need to re-program injector-duty cycle to match. Along with more ignition-advance and more compression and/or boost.
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