Quote:
Originally Posted by WolfpackS2k
[NO]
Sorry that's not how it works. This engine was designed for 91 octane so it will make it's advertised horsepower with that fuel. Perhaps it "could" make more on 93 octane, but only if it is tuned specifically for it. And it's not.
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Nope, the ECU will make more power on higher octane fuel. It pulls ignition timing until it detects knock and then steps it back. On higher octane fuel you can have more timing advance without knocking. The ECU is optimized for a specific octane but it will still make more power on higher octane, or less power on lower octane. I think it is actually optimized for 93 octane anyways, I believe that's what's listed on the gas door. It probably is not a huge difference between 91 and 93, maybe 5hp.