I was using BP in my '88 Escort up until a few months ago and I noticed a Texaco that was about $ .25 a gallon cheaper at the time so I filled up there. My mileage on that car is better on Texaco than on BP. I tried BP since and every time I put it in the tank my FE drops. I also tried Citgo recently and the FE dropped again. I can run the gas that Walmart, Sam's Club, Speedway or Shell sells and get as good of mileage as I do on the Texaco. I've tried several different brands in my '97 Escort wagon and it doesn't seem to effect its mileage. If it does it's so minimal that I can't blame the gas.
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