| I get about 1 mpg better when I run 91 vs 87. 91 is $2.31 a gallon, 87 is $2.11. ($.20 for...
I get about 1 mpg better when I run 91 vs 87. 91 is $2.31 a gallon, 87 is $2.11. ($.20 for 1 more mile per gallon) However I usually gas up w/ 91 as I feel the performance is better.
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