Why do people wait 10-15 minutes to fill up at Costco to save 2 cents a gallon vs other, faster, stations nearby?
I've almost always needed to get premium gas (92-93 octane) for my vehicles based on engine tune and/or modifications, and in Monmouth County NJ at least, the savings on that have definitely (and sometimes significantly) been more than 2 cents per gallon between Costco and other spots. Assuming 15 gallon fill-ups at Costco averaging twice a week for 4 years at a savings of $0.10 per gallon compared to other places, that amounts to $450.
Nowadays, I'll try to time fill ups at Costco on weekends, early in the morning or in the evening before the station closes, to avoid the crowds. It was more difficult to do so when driving to work daily and rushing to RU for grad school right afterward most evenings.
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