Absolutely agree. That was 100% purpose of the Keystone XL pipeline. In addition to being the most efficient(cheapest) refineries in the world, the TX/LA refineries have the excess capacity to refine more oil than they are currently bringing in.
The increase in importation of Alberta Canada tar sands oil would have been a direct competition to Venezuela, Iran and other Heavy crude, high sulfur oil producers.
This is similar to the fact that an increase in production of Balkan(MT, ND) light sweet crude and SW Texas(shale oil)light sweet crude would reduce the import of Nigerian light sweet crude.
This is why other oil producers in other parts of the world unite with organizations like the Sierra Club to stop the increase in US domestic oil production.
That I didn't know.