Costco gas savings of $0.20 to $0.30 on AKI91 can easily pay for membership. As far as product quality and quantity, it is up to customers to cross shop and decide, esp. on bulk brand names that can have exact side by side comparison.Those warehouse club stores are good for a lot of consumables. I don't need "boutique" everything. Our biggest purchases from Sam's Club are spring water, cat food, cat litter, and toilet paper.
Costco's gasoline actually meets Top Tier Gas standards. Sam's Club's doesn't.
Our gasoline retail system is very inefficient. There's a gas station on every corner, and people demand that they never wait in line to fill-up. A lot of gas stations only make money from their convenience store sales. The warehouse club gas stations usually have lines, but they're short. A lot of people are willing to wait five minutes to save a few bucks.