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E85 requires approximately 30-35% more fuel, so your gas mileage will drop roughly 30-35%. A custom tune would probably help as the OFT tune is probably on the richer side overall compared to a custom tune further dropping gas mileage.
You should get flex fuel custom tune so whatever 93, E85 or any ethanol % blend will have the tune automatically adjust. So you can just fill with whatever and not worry about it.
E40 is equivalent to about 100 octane, and will have a much less detrimental effect on gas mileage vs E85 while still providing phenomenal gains/benefits.
True E85 should be about 6gallon 93 to 5gallon E85 for E40 blend.
This might provide you with best of both worlds.
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