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I used to use BP all of the time in my daily driver an '88 Escort, then I stopped at Texaco and filled up once because it was about 10-15c cheaper and the price stayed lower so I started using Texaco on pretty regular basis and watched my FE go up several MPG over about 3 tanks. I then went back to BP and the FE dropped back down. On my '97 Escort it doesn't seem to make any noticeable differerence. I think that about the only difference in brands is their additive packages and ethanol content. I have been thinking about running about 5 tanks of each different brand in my area and seeing which one gives me the best average FE over the 5 tanks. With winter coming on though I probably wouldn't get as accurate of results as I would if I did it in the summer so that test may have to be put on hold until next summer.
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