North America's biggest oil pipeline -- Enbridge Mainline, which has a capacity of 3.2M barrels per day -- runs east through Sask, Manitoba, ducks down through Michigan, and then splits before coming back into Canada in Ontario in two places (including Line9 ~1km from my house.)

Ontario is one of Alberta's biggest customers.

Then there's westbound ... TMX capacity of 890,000 barrels a day, to BC ports (and then on to China).

vs southbound lines to the US

Keystone, 640,000 BPD

and Express 310,000

Please check your facts.