I would likely recomend that you take a US route ( higher speed limits and zip across at Sarnia)Plan your time by Chicago for a night crossing or do the lake michigan ferry and sleep on board
Yup! US routing for sure.
If it's a "get there," ride, fuel is cheaper, availability is vastly greater on the US highways, and the average speed limits are higher.
Bill is referring to the ferry that leaves Milwaukee in the AM, and scoots you due east, so you can exit the ferry, and cross into Canada at Sarnia.
Bill and I took that ferry last year during the Iron Butt Rally, route planning and sleeping.
Besides, Wisconsin has, and I mean this literally, picture perfect scenery and roads. I'm going back to Wisconsin, and soon.