Jeff,
Nice to see you are back! Where've you been?
Anyhoo, 91 octane is the minimum requirement. GT motors are 50-state certified, so they all have to use the same minimum octane requirement. In California and a few other places, 91 octane is considered premium fuel, that's why 91 is considered the minimum. Technically, we could blend a 50/50 mixture of 89 and 93 to generate 91 octane and engine performance will not suffer *supposedly*. It has been my experience that anything less than premium fuel causes a performance decrease since engine timing gets pulled due to the knock sensor noticing light knock. In my area, premium fuel is 15-20 cents/gallon higher than regular. At worst, it is a $3.00/fillup (15 gallons max) "penalty" to make sure the engine is healthy and won't knock. It's a small price to pay for the smiles you generate everytime you stomp on the gas pedal.
My two cents,
Scott
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