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I prefer using chevron, in all my cars.
My pick-up gets 12.5 mpg when I purchase gas in Calif. When I went to Az. my gas mileage went to 17.5 mpg??? The refinery is in Tucson, and it seems like their gas is much better than the gas in Calif.
I'm just wondering if gas brand makes a difference in mileage. I haven't really kept track with the mileage in my vehicles but my car seems to get about 2MPG more with Costco than with the United Oil gas near my house.So what do you put in your vehicles and how does it affect mileage?
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