in my more cynical moments,i sometimes wonder is there are really 3 grades of gas,or if they all come from the same tank.i don't really think this ,but got the image when a friend of mine who worked in a college beer bar,which sold cheap pitchers to people without a very sophisticated beer palate,told me they had about 14 beer taps with different brands of beer on them.they all went into one keg of milwaukee's best!
nc checks gas pumps for accuracy of measure,but not for octane.
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