What else can you say? Costco is great, and Costco gas is even better. Cheaper than other locations for sure. Only thing I can say is they should open smaller gas locations around town. Not a lot, just enough that you don't need to live by Costco or have to get off the highway in the middle of the commute for gas. I am sure if they did though, the price would be higher.
Also, they could be more uniform. The Costco by my house has two locations after you get gas, for cleaning windows. Simple buckets filled with fluid and a couple squeegees each, nice. This location did not.