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You kinda miss the point here. The only reason it says 87 "can" be used it marketing. If owners manual said 89 or better must be used, it would hurt sales. Hey, I did not make the rules but as you raise compression, you must raise octane or performance will suffer plain and simple. The auto makers use knock sensor to retard timing to try to minimize the knock with low quality fuel but it hurts performance and MPG too. Also, you have to remember that I come form a time when regualr was called 94 (about 90 with todays ratings) and premium was 100 or better and you bought cars fully expecting to use premium though some tight wads would try to burn regular in than and let the knock away. I do not have a proble with using better gas so regardless of what manual says I will use the fuel it really needs baised on how it performs. Most of todays drivers are not to bright anyway as they will blow a tire and sue tire maker when they are too stupid to check tire pressures themselves and low pressure is the number one cause of failures anyway.
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