Costco updates their prices based on a number of factors. But they are running the data every 15 minutes to adapt to market changes.
Due to their volume of sales and this near instant price adjustments you will see their prices react to the “market” faster than most other stations.
When prices were at an all-time high a year or so ago and then Biden announced he was releasing some reserves my local station, at a point in time was over 1$ less per gallon than the nearest station
My buddy’s and I have started reading through stormlight together. I put it off for years but I have been really enjoying it. Already mostly done with book two.