As long as you are buying quality gas, it shouldn't affect mpg. The only thing that might be a factor is whether or not the gas has ethanol in it (which most does these days, i believe.)
The cheapest gas at just about every station in the us is going to be 97 octane. 89 is mid grade, and 91 or 93 is the top (depending on location... some will have all 4... some may still carry 94 octane. Sunoco used to in my area.)
The cheapest gas at just about every station in the us is going to be 97 octane. 89 is mid grade, and 91 or 93 is the top (depending on location... some will have all 4... some may still carry 94 octane. Sunoco used to in my area.)
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