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I will give you my advice: Run the lesser aggressive tune, i.e 91oct. 92oct E10 still produces a fair bit of knock on OTS 93oct maps if environmental conditions are right, and since you're so close to me environmentally I will wager that this will be true on an average day with a 100% properly working stock system
even with the E85 still in the system, no guarantees that the mixture will be uniform or above the 93 threshold
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