Sault Ste. Marie combines two fuel-market personalities: a northern Ontario city with the north’s higher floor, and a border town staring across the St. Marys River at cheaper Michigan gas. Competition concentrates along Great Northern Road — the big-box spine running north from downtown — with Trunk Road serving the east end and Second Line crossing the city’s middle.
The cross-border math is the standard one: the Michigan Soo usually posts a lower per-litre equivalent, but the bridge toll and exchange rate mean a dedicated gas run rarely pays — it is a bonus errand for trips you were making anyway. At home, the list below ranks every Sault Ste. Marie station we track by current price, refreshed hourly.