L o v e Costco! And the gas station is one of the best reasons. Lowest prices on gas anywhere. Period. No more, no less.
And just to demonstrate that Costco extra something, they have helpful attendants who keep an eye on everything -- even problems you didn't know about. Much talk in the local news currently about these things inserted into credit/ debit card readers that abscond with all your financial info off of the magnetic strip. Costco was patrolling for these things w e e k s ago! Checking everybody who filled up. Costco was ahead of the curve.
Costco used to only accept debit cards and their own credit card (AmEx, I think, at the time). Now Costco accepts V i s a , too! Perfect.
Wish more stores were like Costco. Thank you, Costco.