You are correct, the US does produce enough oil for themselves, but the two key factors would be they that don't have enough refinery capacity to refine their type of crude, and the other factor being it would cost Americans more as they wouldn't get the discount they are getting from us. The biggest issue would be the refining capacity for light crude, because currently much of their refining capacity is for heavy crude. They could get the heavy crude from Venezuela, but it would be time and a lot of money to get Venezuela up to a point of producing ~5 Million barrels a day (one million barrels for them, and 4 million barrels for the US).That was my gut take too, they couldn't afford to go without AB oil until VZ increased production, but now I'm not sure that the case..
The US has been a net exporter of oil for a few years now, with the surplus being a bit over half of what they get from Canada.
I'm not an industry expert on this, but seems like it'd be easier for the US to import 4mbpd from someone else than it'd be for Canada to sell the same to someone else, without more coastal pipes in place.
My references, such as they are:
The US could get around using us, but it would take time and money, and ultimately be more expensive. Just like we could eventually get around selling to the US, but it would take time and money as well.




