Ontario Costco Gas Prices

Costco operates 28 fuel centers in Ontario across 22 cities, with the largest cluster in Etobicoke (2 stations). Across the province, regular gas averages 164.2¢, premium runs about 24.3¢ higher at 188.4¢, and diesel sits at 238.9¢. The lowest-priced regular pump is at Costco N Oshawa in Oshawa at 154.9¢, while Vaughan in Woodbridge sits about 15.0¢ higher. Across the province, regular pump prices have eased about 7.4¢ over the past month, from 171.5¢ a month ago. Premium has eased about 6.7¢ and diesel has climbed about 4.0¢ over the same period. Diesel is sold at 1 of the 28 Ontario locations.

If your vehicle takes premium, the lowest in Ontario is Costco Windsor in Windsor at 181.9¢. The cheapest diesel is at Costco N London in London at 238.9¢. Pump prices shift from one warehouse to the next with local taxes, fuel-blend rules, and transport costs, but Costco fuel is members-only and usually runs below nearby branded stations — which is what keeps these pumps busy.