Where to fill up along the 401

I usually stop at Kingston (Division St exit) for some fast food and a toilet break en route to/from Toronto/Ottawa, and to fill up the gas tank. But I learnt something new today from a more experienced 401-weekend-commuter. While the Division St exit is still the most convenient place for food, the most inexpensive place for gas is the Flying J at Napanee. Apparently this normally saves you about 4 to 5 cents per litre, and in today's case, a whopping 9 cents per litre.