when i used to drive between cincy and columbus a lot a couple summers ago, I did a little experiment of my own to see what was the best gas. (by best gas i meant best gas mileage...don't know how you would gauge it) I would get gas at different gas stations and see what kind of mileage I got out of the tank in the somewhat controlled environment of I-71. The best results were always with shell gasoline. everything else was ok, but the absolute worst was BP. bwuff, i consistently lacked at least 40 miles to the tank when I filled up with bp.