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These are high compression motors and they really should only be run with 91 or higher octane. You may not notice a big performance difference using lower but it's there. You also most likely will not hear the knocking because the computer takes care of it pretty well but it is there and can do damage if low octane gas is used too often. I can prove the performance difference by looking at a chart of my car on fuelly and see a nearly 5mpg drop when I ran a tank of 87 because it was all that was available when I needed gas once last year. All other parameters were the same other than that one tank. In hindsight I should have just put in a gallon or two but was so used to filling the tank I just did it.
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