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I use premium.
How does your car adjust for knocking?
I have read that the first thing the computer does is increase the fuel - this cools the cylinders - changing the timing does not help because ignition is happening before spark already.
Besides the economics of fuel prices has changed - the price differences are a much smaller percentage of the cost of a gallon.
Older engines knock more readily then newer, cleaner ones.
I find that the difference in MPG is worth the price.
I also like to keep my engines happy!
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