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Originally Posted by Adam
I think you're getting the compression ratio mixed up with the air/fuel ratio. An 11:1 air/fuel mixture is extremely rich and the engine would run very poorly. Optimum A/F mixture is around 14.7:1. Eslai, you should definately get a tune done, you'd probably pick up a nice amount of hp and improve the curve even more as you suspected. The computer doesn't richen up the A/F mixture if you run low octane, it just pulls timing so the 91 oct gas isn't why your A/F is rich. Your engine is definately not running at it's peak at 12.5:1
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Nope, at full throttle, the optimum power is made at about 12:1-12.5:1 AFR. Stoic is good for fuel efficiency at lower loads, but there's more power at more rich mixtures due to flame front speeds and the inefficiency of combustion.