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I would be very surprised if there was a noticable, or even measurable, difference by burning more expensive gasoline. The engineers have optimized the engine to run on commonly available gas. Additionally, there are many factors other than ignition timing that affect combustion... compression ratio, valve timing, combustion chamber shape, intake and exhaust runner length & shape, etc.

For the ~50 cent difference between 87 and 91, I will be using a Top Tier 87 for the life of the vehicle.

Enjoy!
 
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