I've not seen any test data to support that claim but I doubt it. Here's the deal on E85, it has a high octane rating and as such is hard to ignite. So the flame front will be slow to form. Now if you had a high compression engine, like 12:1 or more, you could really get some serious power out of E85....but you don't have that. The probabilities are a lot higher that because of the resistance of the fuel to ignite, most likely carbon deposits will form which is the opposite of what you want. But again, I've not seen any testing in that regard and that's a gut assessment of the situation. But if you knew you had a steady supply of E85 and were building an engine, I'd push the compression up to take advantage of the octane rating of E85 and watch the competition disappear in the rear view. Problem with E85 is that we don't have engines to take advantage of the fuel capabilities.