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I use the 89 mid-grade. I have an '05 Altima (bought new) with the same double ovh cam / 4 valve setup. At first I swapped constantly between 87 and 89. My final conclusion after 20,000 miles that the extra performance was worth the extra 15 cents per gallon. It also would bing once in awhile with 87.
I decided that my 2LT deserved the same gas from the start.
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