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the higher octane is primarily to run more timing. lower your timing down, and run all the 87 octane you want. the car can automatically retard timing, but only so much.
but why would you want to retard timing when you own a porsche, to save a couple of dollars/fill-up?
on the flip side, if you run higher octane, like 100, etc. then bump the timing, and get more power : )
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