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Also, FWIW, I would check your knock sensors and see if they are pulling timing. If they are, raise the octane until they no longer hear knock. Too much octane is almost as bad as not enough. With my 95 LT1, it was recommended @ 87o. I had to run around 90o to keep it quiet.
Also like King said, 91 already has some alcohol on it. Try to blend in E and you're out of the ecm tables. It really needs the sensor to optimize it. And I'd be willing to bet running E would void the warranty (since it is over 15%) a lot easier than toluene/xylene.
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