I don't have a working gas meter, so I go by my mileage on the trip meter. I always try to avoid Wal Mart gas(Murphy Oil). Since I have a trip meter that corresponds when I last filled up, I always calculate it out. And always it comes out about 1.5-2 mpg less then when I do it for Shell or Chevron.
Maybe I just happened to drive worse the few times I had to get WM gas.


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