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I always buy non-ethanol 91 octane. My JRSC FI engine runs smoother (and no crickets) if I use non-ethanol 91 octane instead of 93 octane ethanol gas. I should do a datalog one day to check the difference.
I think the answer depends on the tune most. There was no noticeable difference between the two when the engine was stock (other than crickets).
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