E10 will theoretically give you worse fuel consumption by 3% due to the lower calorific value. That balances against the slightly higher octane (about 93 instead of 91 if the ethanol is blended with regular unleaded) that allows more ignition advance. I haven't found much noticeable difference between regular ULP and E10, but I can't get regular ULP here anymore, it's E10 or 95 octane now. I use E10 and it works fine.



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