Costco gas bars are the price anchor of the Calgary fuel market. On a typical day, Costco regular runs 10–20 cents per litre below the major chains, and its premium (91 octane) is often the cheapest premium fuel in the city by an even wider margin. The catch is well known: you need an active Costco membership to pump, lines peak on weekends and weekday evenings, and payment at the pump is Mastercard or debit.
The database includes Calgary-area Costco records for Beacon Hill, East Hills, Buffalo Run and nearby communities. Address variants may refer to the same site; confirm the physical gas-bar location with Costco before a special trip. The directory is not an authoritative count of operating gas bars.
Costco fuel is standard-spec gasoline with deposit-control additives (it meets Top Tier standards), so the discount is a business-model choice, not a quality difference: the gas bar exists to drive memberships and warehouse trips. If a fill is 60 litres, a 15¢/L gap covers a good chunk of the membership fee in just a few months of fueling.