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Ethanol has lower energy content, but offers great knock resistance and cooling in direct injection engines. On the Mazdaspeed 3/6 platforms, running a 2-3 gallon mix of E85 + regular 91/93 gas gives great gains. The Cobb AP allows for increase fueling to deal with the lower energy content, however, the platform is still fuel limited when running E85 mixes as no one makes aftermarket injectors.
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