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diodelphi or mid_life_crisis? I would be surprised if 20% E caused that lean a mixture. E100 - with a stock tune - definitely. In which case... SMH... from the context above, I thought he was tuned for E70 already. The AF correction limits can only do so much, and you would have to be pushing probably 40% to 45% more pulsewidth for E100.
Agreed on the approach - basically I would get it tuned for a known steady state level of E, and then add a flex fuel sensor into the mix so that he has the flexibility of throwing in gas occasionally, and not worrying what the exact mixture is. I still wouldn't run pure ethanol...
Bottom line is you have to tune for ethanol, otherwise there's no point.
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