I only buy gas at Costco if I'm going to shop there. I only go shopping at Costco early in the morning on the weekends or just before they close on a week night so the gas line is never bad. I don't think I have ever waited more than 5 min to get gas. The gas at my local Costco is on average $.20 a gallon cheaper than a regular station. 25 gallons per fill up is a savings of $5. That buys me a hot dog and drink while I shop in Costco.

I agree with you on saving the pennies from station to station. I won't wait in line to save $.50 per tank full.