In short bursts you don't need to be nervous. I use Cobb's ATR software here in Colorado to run 18psi or so peak, and falling to about 14psi at redline. 91 octane or E85. I just run a much different timing map for E85. But I don't run full throttle for more than 1/4 mile at a time. If you're concerned, sticking with Cobb's OTS maps works fine. But I really like E85.
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