Costco is the hard floor of the Winnipeg gas market. The warehouse club’s gas bars price fuel as a membership perk rather than a profit centre, and on a typical day they post the lowest numbers in the city — commonly around 10 cents under the citywide median, and more against the priciest pumps when the market is mid-jump. Together with Red River Co-op’s member equity, Costco is a big part of why the gap between Winnipeg’s floor and its average is wide enough to be worth planning around.
The catches are the usual ones: you need an active Costco membership to pump, payment at Canadian pumps is Mastercard or debit, and the queues at peak hours can be long enough to eat the savings for a small fill. On a 60-litre tank a 5–10¢/L gap is $3–6 — worth a modest queue, not worth a special crosstown trip. The live sections below show every Costco gas bar we track in the Winnipeg area with its current price, refreshed hourly, so you can weigh the gap honestly against the majors on your own route.