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^ if the mapping takes advantage of the higher octane then maybe. But i don't see it happening. Plus, its not like if you put a tank of E85 that you'll suddenly see a difference. Most Owner's manuals will tell you that it takes 2-3 tanks of fuel for the ECU to fully adapt to a fuel change.
I understand they are dual mapped but they still have to learn the fuel characteristics. Just like how your car is currently learning as you drive it, it starts over on that task when switched to a new fuel.