As I recall, heavy sour oil of Alberta is essential for American, not home soil, refineries, while the US factories are incompatible with domestic shale oil. Lighter oil they mix with Canadian, crude and heavy. Hence the interdependency almost excludes any effective reciprocal means of diversification or blowback, in absence of oceanic ports that might export crude Canadian oil or refineries fitted for it.

The only solution I envisage is to develop the refining capacities in the Western Canada. But I have serious doubts whether it could be done quickly.

Where, per your opinion, will be the gasoline price spike more painful, in Canada or in the US?