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I like adding a little bit of E85 to boost the octane a little. 91 makes the ECU retard ignition timing. Something like 5% so the total is something like 13.7% ethanol at most.
Ethanol as an octane booster is somewhat useful on a macro level because while it only barely reduces net oil usage, you can use less processed hydrocarbons with lower octane rating more efficiently in engines.
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