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Message: <blockquote data-quote="TulsaMike" data-source="post: 4202829" data-attributes="member: 49625"><p>This is absolutely true IF your car isn’t tuned for the higher octane. A car meant to run on 87 won’t make any more power (actually makes less) with 91 or 93. A car properly adjusted for higher octane can make significant gains. I’ve done a lot of e85 tunes on vehicles and even naturally aspirated, the ethanol makes a noticeable part throttle different with the better resistance to knock. Unfortunately the cheaper cost of ethanol when factored against the lower mileage usually evens out unless gas is on a high week.</p></blockquote><p></p>