Some more food for thought.
One thing that is rarely discussed in regards to e85 is fuel temp. Your mixtures can vary up to 15%, based on the temp of your fuel. V8 supercars run a fuel temp correction on their tune, to allow for this.
For most, this would not come into much of an effect, but when you start getting into higher power figures, and particularily if you start pushing closer to the limits of the fuel, it is a wise thing to consider.