A one-cent move may not sound dramatic after the week Toronto drivers have just seen, but the return to 181.9 cents per litre is another reminder of how unsettled Canada’s fuel market has become. Gas Wizard lists Toronto regular gasoline at 181.9¢/L for September 19, up from 180.9¢ a day earlier after prices briefly surged to 188.9¢ on September 17. In Charlottetown, the same service lists 212.6¢/L, creating a gap of more than 30 cents per litre.
That comparison needs an important qualifier. Prince Edward Island regulates petroleum prices, and its regulator lists a higher official self-serve range of 214.9¢ to 216.1¢ per litre effective September 18. The difference between those figures reflects data and timing methodology, but both point to the same reality: drivers in Atlantic Canada are facing especially high pump prices while Ontario remains volatile.
Toronto’s Small Increase Follows a Wild Week at the Pumps
Toronto’s move back to 181.9¢/L looks modest in isolation, yet it comes after one of the sharpest sequences of daily swings seen in the city this month. Gas Wizard’s history shows regular gasoline at 182.9¢ on September 15 and 16, then 188.9¢ on September 17, followed by a steep retreat to 180.9¢ on September 18 and a one-cent rebound on September 19. CityNews, using En-Pro forecasts, similarly documented a six-cent jump for Thursday and a nine-cent drop expected for Friday.
Those reversals matter because motorists rarely experience fuel costs as a smooth trend. A commuter who filled a 50-litre tank near Thursday’s peak would have paid roughly four dollars more than someone filling after Friday’s drop. Gas Wizard also shows Toronto’s 30-day average near 181¢ per litre, meaning Saturday’s price is close to the recent norm even though the path back to that level has been unusually erratic for drivers.
Charlottetown’s Price Gap Is Hard to Ignore
Charlottetown stands out because the quoted level is not merely a few cents above Toronto. Gas Wizard lists 212.6¢/L for September 19, more than 30 cents above Toronto’s 181.9¢. On a 50-litre fill, that spread works out to about $15.35. Gas Wizard also identifies Charlottetown as the highest-priced city among the locations it reports, underscoring how much geography continues to matter in Canada’s fuel market and how quickly regional differences can alter a household’s weekly driving costs.
The provincial regulator, however, publishes a different and more authoritative retail range for P.E.I. The Island Regulatory and Appeals Commission lists self-serve regular gasoline at 214.9¢ to 216.1¢ per litre effective September 18. That makes a 50-litre purchase at the minimum regulated price about $107.45. The mismatch does not invalidate the broader comparison, but it does mean 212.6¢ should be treated as a market-service quote rather than P.E.I.’s official posted pump range there.
P.E.I.’s Regulated System Works Differently From Toronto’s
Prince Edward Island’s pricing system helps explain why its pump prices behave differently from Toronto’s. IRAC regulates petroleum pricing and adjusts gasoline, diesel and furnace-oil prices twice a week, with scheduled changes taking effect on Tuesdays and Fridays. Its September 18 gasoline calculation used an average rack price of 165.4¢/L, added a five-cent wholesale margin, a forward-averaging adjustment, provincial tax, a permitted retail margin and HST before arriving at the self-serve range.
That structure can make prices more predictable between adjustment dates, but regulation does not insulate the province from expensive wholesale fuel. Natural Resources Canada notes that retail gasoline prices reflect crude costs, refining margins, marketing and distribution costs, taxes and local competition. P.E.I.’s formula still begins with the underlying rack price, so a high wholesale market can pass through to motorists even when margins and timing are controlled. Regulation changes pricing mechanics; it does not remove supply costs.
Taxes Explain Only Part of the Difference
Taxes contribute to pump prices in both provinces, but they do not by themselves explain the roughly 30-cent gap between Toronto and Charlottetown. Ontario’s gasoline tax is 9¢/L, while Natural Resources Canada lists P.E.I.’s provincial gasoline tax at 8.47¢/L. P.E.I. applies 15% HST, compared with Ontario’s 13%, so the percentage-based sales-tax burden rises as the underlying fuel price rises. Even so, the provincial per-litre tax is slightly lower on the Island.
Federal policy is also temporarily reducing the tax component nationwide. Ottawa extended the suspension of the usual 10¢/L federal gasoline excise tax through January 31, 2027, after first introducing the relief in April. P.E.I.’s current regulatory breakdown shows the federal excise line at zero. That means unusually high prices are being recorded despite the federal tax holiday, reinforcing that wholesale gasoline, refining constraints and regional supply conditions are doing much of the heavy lifting behind current pump prices today.
A Major Midwest Refinery Added to Ontario’s Price Whiplash
One reason Ontario prices have swung sharply is strain on the Great Lakes and U.S. Midwest fuel system. Exxon Mobil’s Joliet, Illinois, refinery was taken offline after a power outage on September 13, and Reuters reported that floodwater later overwhelmed a pump while the facility remained shut. The refinery processes roughly 275,000 barrels a day and can produce about 11 million gallons of gasoline and diesel daily, making it an important Midwest supplier.
That matters north of the border because Ontario wholesale prices are connected to Great Lakes trading conditions. By September 18, reports indicated the refinery was entering a restart process, and wholesale gasoline prices in parts of the Great Lakes region had fallen roughly 20 to 40 U.S. cents per gallon. That does not translate one-for-one into Toronto pump prices, but it helps explain why a sharp spike can be followed quickly by an equally striking retreat locally.
Oil Above US$100 Keeps the Market Vulnerable
Refinery trouble is only one part of the pressure. Global crude prices remain high enough to keep gasoline vulnerable to another round of increases. Reuters reported that West Texas Intermediate settled at US$100.30 a barrel on September 18, while Brent also finished above US$100 as markets reacted to disruptions and geopolitical risks in the Middle East. It noted that damaged infrastructure and constrained shipping routes were still complicating energy flows.
Natural Resources Canada describes crude oil as one of the most important drivers of retail gasoline prices, but not the only one. Refining availability, inventories, transportation costs and local supply problems can amplify or soften moves in crude. That is why Toronto’s pump price can fall even when oil remains expensive, or rise suddenly after a refinery problem. For Canadian drivers, the market is shaped by both an expensive global feedstock and tight capacity to turn that feedstock into fuel.
The Difference Adds Up Quickly for Households
The household effect is clearer when the per-litre figures are converted into a normal fill-up. At 181.9¢/L, 50 litres in Toronto costs about $90.95. At Gas Wizard’s 212.6¢ Charlottetown figure, the same amount costs roughly $106.30; at P.E.I.’s official 214.9¢ minimum, it is about $107.45. For families with two vehicles, long commutes or frequent rural driving, repeated gaps of that size can become a noticeable monthly expense, especially when several fill-ups are needed.
The broader inflation data show why fuel remains economically important. Statistics Canada reported that gasoline prices were 22.8% higher year over year in August 2026, while the transportation component of the Consumer Price Index was up 7.5%. Overall inflation was 3.0%, but CPI excluding gasoline rose 2.4%. Those figures show how energy can widen the gap between headline inflation and underlying price pressures, particularly for households that cannot easily reduce driving or use another form of transportation.
What Could Move Gas Prices Next
The next moves will depend less on one daily quote than on several market signals. For Toronto, the restart and stabilization of the Joliet refinery matters because Great Lakes wholesale gasoline prices had already begun easing on expectations of restored output. A sustained decline in wholesale costs would normally reduce pressure on retail prices, but the timing is not automatic and local stations can adjust margins differently. Crude prices above US$100 also leave little room for complacency.
Charlottetown follows a different timetable. IRAC’s twice-weekly schedule means regulated resets reflect changes in period-average rack prices, allowed margins and tax calculations rather than Toronto-style daily competition. With the federal excise tax still suspended, key indicators are wholesale gasoline prices, refinery availability, crude markets and the regulator’s published rack-price inputs. After a week of dramatic swings, the safest conclusion is that relief can arrive quickly, but so can another sharp reversal right now.
