Quote:
Originally Posted by Shawn D.
Higher octane than necessary reduces efficiency, as the burn is cooler. Increased octane is of no benefit if there is no pinging/detonation or the ignition can't be advanced to take advantage of it.
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While this is true, I think it's fair to say 87 octane e10 is 87 octane in the same was the 87 octane non-ethanol gas was 87 octane before the ethanol mandates.