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Running 89 with no ethanol bumped up my fuel economy a bit. I think it appeases the 91 map a bit. And if u don't drive a lot having ethanol free is the way to go.
 

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I don't seem to have any issues with it taking time to adjust. I'm guessing if you don't run your tank down low before filling up it will be diluted a prevent it from fully utilizing the 91 map.
 

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I'm thinking most people fill up at or before 1/4 tank. That's a lot of dilution and doing that every time would take a few fills to get it close enough to 91 octane to prevent pinging and allow the 91map to take over. I typically run for 20-30 miles after range stops reading. So should be less than a gallon to dilute a 11-12 gallon fill. So 8% vs 25%.
 
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