I do know that when we were living in MD virtually all of the gas stations charged somewhere between 3-7 cents more per gallon if you used a credit card. If you used the company's branded card Shell, Mobil, BP, etc it was the same as cash. However if you wanted to use your Visa, MC, AmEx or Discover you'd pay more for your gas.
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"I did not get into rock-n-roll just to pick up chicks. However..I was able to adapt". Ted Nugent
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