Quote:
Originally Posted by ken0042
I've always used premium or mid-grade in my vehicles. I found that the increase in fuel economy offsets about 1/2 of the price increase.
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If I recall you drive a Grand Am, which only requires 87 octane. Putting anything above 87 actually slows your car down and decreases fuel economy.
At our altitude lots of naturally aspirated cars can actually get away with going below their octane recomendation because of our thin air.