Comment: I know some people that tune

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In reply to comment: I hate ethanol (see in situ)

I know some people that tune

I know some people that tune their cars for ethanol 85, and according to them it has a pretty high octane rating; so they can extract quite a bit more performance out of their engine using it as opposed to normal gasoline. Of course, it contains less potential energy so more needs to be used to produce similiar performance and due to this the fueling system usually needs to be upgraded to flow better.