Thread: octane rating
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Old 06-06-2012, 07:37 PM
docgatling docgatling is offline
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In the old days if your motor suffered knock you switched to higher octane. Modern cars (and trucks!) have knock sensors to prevent damage to the engine if to low octane in injected. Your eingine will run but suffer in the preformance department. So, I would run a couple tanks of both and see how your engine performs. Monitor your gas mileage with 89 then try 91. If you don't see any difference use the "cheaper" stuff. There is a good article in Road and Track about octane and its effect on engines. It's not just about compression anymore.
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