Cornwall anchors Ontario’s eastern tip, and its geography works in drivers’ favour: with Quebec’s higher fuel taxes starting just up the 401, Cornwall pumps are the cheap side of the provincial border, and Quebec-plated cars topping up are a routine sight. In-town competition runs along Vincent Massey Drive and Brookdale Avenue near the 401, with Second Street carrying the downtown cluster.
For Montreal–Toronto travellers the rule is simple: fill on the Ontario side, and Cornwall is the last (or first) real market to do it. The list below ranks every Cornwall station we track by current price, refreshed hourly.