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if you run a scangaugeII you can see the difference in the ign function. as the previous posted said, you need to run what the car is designed to run on.
I had a post a while back about the dramatic effect NOT running premium had on the mileage and the performance on my trip to texas from CA.
If you are just an everyday driver, not paying attention to anything, it won't ever matter.
But if your on this forum and your trying to mazimize everything.....run what your car says to run.
ps running premium when the car says run regular is a waste (in my humble opinion).
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