Does it Matter where you buy gas?

There's no Exxon gas in Seattle area. :P The common gas stations we have is Shell, Chevron, 76, Texaco, Arco and some 7-11 gas stations. There's only one Mobil gas station that I've seen so far. There's also Costco, Safeway and Sam's Club gas stations, too. I don't have a membership with Costco or Sams club.
 
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