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That last thread is pretty informative. I'd also add that in Colorado they don't even sell 93 octane gas because of the air density altitude here. The best that is generally available is 91. Sometimes 89 octane is sold as premium and regular gas is 85 octane, with mid-grade being 87.
I live at 8700 feet and I guess you lose a lot of compression up here with a naturally aspirated engine.
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Dave S.
2003 Boxster S
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