11:1 too high for pump gas?

IQ52 said

Went from 110 octane to E85. Dealing with the corrosion I experienced in my fuel system turned me off. Then I found out I could make more horsepower with 91 octane than most people could make with race fuel. I will never build another high compression engine. It's simply not worth it, to me.

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I was talking to a fellow whose brother has a 900HP mustang running E85. I didn't get into detail about what compression he is running .. I wished I asked... but the car is EFI. I know it's doable but was interested in the pros and cons of E85.

I would like to hear the way you make more HP with low octane rather than race fuel... or is it top secret?:D