Costco reminds me of that conglomerate in Wall-E... What were they called? BUY-N-LARGE.
Ok, we all know corporations get a ton of flack. "They're evil!" "They're big and don't care about the customer!" Yeah yeah, ok, why are you still shopping with them? "Because they're the cheapest". OK but if you care that much, you'd MAKE it a way to shop somewhere else...
Anyway, yes, Costco Gas tends to be the cheapest in the area that it's around. Even my AAA app on my phone tells me, the cheapest gas tends to be Costco.
As far as this specific location goes, their core infrastructure allows multiple lanes to offer gas to customers like other Costco locations. Uniformity. Consistency. These are strong values that bring me back to the location other than cost.