Self Sufficient you say then why does the U.S. buy our oil and always has. Yes you do have your own supply but still buy ours. That's why we have pipelines heading South. Yes, we ship our oil to get it refined which is a head shaker because we used to do it ourselves. There used to be a huge refinery in Toronto years ago. I think they built a university on that property now.
You have oil wells up north of us that produce a real heavy crude and us truck drivers would haul or sweet crude to Canada and mix it with your heavy crude so it would flow down the pipe line. Don't know if that's still happening now.