Premium gasoline carries the widest markup spread of any grade in Toronto. At warehouse-club gas bars the premium-over-regular gap can be as small as 12¢/L, while full-service stations in Yorkville, midtown and along the Gardiner-adjacent core stretch it to 30¢/L or more. If your vehicle requires 91 octane — and a lot of the turbocharged German and luxury vehicles on Toronto roads do — choosing the right pump matters more for premium than for any other fuel: $8–12 per tank between the cheapest and priciest station on the same afternoon.
Most priced stations we track in the GTA sell a premium grade, typically 91 octane. Shell V-Power and Petro-Canada Ultra 94 run higher octane at a higher price; Costco premium is standard 91 and is usually the cheapest premium fuel in the Toronto area by a wide margin — its gas bars at Warden Avenue in Scarborough, Billy Bishop Way near Downsview and The Queensway in Etobicoke anchor the low end of the ranking most days.
One caution that applies to premium more than any other grade: only pay for it if your car requires or measurably benefits from it. If the owner’s manual says “premium recommended” (not required), a modern engine runs safely on regular with a small performance reduction. If it says “premium required”, use the list below to pay as little as possible for it.