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Old 12-02-2003, 01:48 AM   #6
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Join Date: May 2002
Location: Sacramento, CA
Posts: 445
FWIW I run 89 pretty frequently, especially for long trips on the highway. I can't honestly say I feel a difference. The engine is supposed to compensate for it, and I don't put it in high gears in low speeds...that's what creates knocking, right?
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