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I use Shell all the time unless I need gas now and there is not one around. My car(s) seemed to run better on it, as far a smoothness feel when on the throttle and even mpg. Really noticed it when I had my Lincoln LS8, ran on Shell for a long time, tried some cheap station one day, car felt different/ran diff and mpg sucked. It did run decent when I put exxon in it once but I stuck with shell. The Balt seems to like shell, but I have not really put anything else in it besides one trip to NY and used Mobil to fill before leaving.
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