Through the US, but I disagree with the Saskatchewan route. While it is shorter distance wise, I think you save more money going through Montana since gas is a touch cheaper.
I've made it with 2 overnight stops before. Cross at Coutts, AB/Sweetgrass, MT, take US-2 to Glendive, then across the I-94 all the way to Detroit/Windsor, then 401 it up to the 416.
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