quote:
Originally posted by GT Mike:
Ethanol also increases burn efficiency, and since it is an octane improver, engines with knock sensors can take advantage of this with a couple more degrees of advance which would bump any power loss from the ethanol back up to a comparable level as on straight gasoline.
Prove it to yourself...Tank up with 89 octane E10 for a couple tanks, then go back to 87 octane regular gas, and compare notes. My experience is right in line with the study linked in my previous post. The difference is insignificant, if any at all.