It is illegal for a Canadian to drive a US tiled vehicle into Canada, unless you are importing and do the paperwork at the border via declaration.
***EDIT***
I'm calling BS on this. You mean to tell me a Canadian living in the States can't drive home over Christmas to see his family in Toronto?
Surely it's illegal for the Torontonian to cross the border for the sole purpose of buying a vehicle to avoid Canadian tax. BUT, a Canadian CAN drive a US titled vehicle in Canada. (I have nothing official to back this claim up except logic.)
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