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It wasn't so much the MPG on different grades of gas but more so like what Brucey said the lack of power and it a knocking noise at different times. In Colorado they only offered 85, the mid grade I think was 87 but maybe 89, and high was 91.
I also couldn't believe that 91 in CO was the same price as regular is in MI $2.75gal about.
Either way on grade of gasoline, having at lest 800lbs or more in the car running 76-79mph with AC on and still getting almost 32mpg seemed pretty good to me.
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