The main reason the U.S is selling its own fuel (rather than use it)...is that its buying fuel from Canada cheaper than its selling its own for on the open market.
The U.S (currently) gets it oil from Canada for the equivalent of about $50 a barrel (a very good deal...much to our Canadian free trade chagrin

). This is also the primary reason the U.S is able to keep its gas prices down comparitively to our western countries....BUT, hopefully soon we can bump that $50/barrel price for our own benefit by getting China in on the buying end of things.
If the U.S converted its own fuel (in terms of market value) for its own use, U.S fuel prices would immediately rise.
As well, Canada supplies well over 60% of the U.S energy needs when you factor in natural gas, etc. We have a huge surplus of natural resources that we are trying to get in better order for world/market sale....no easy feat when you have the 2nd largest country in the world populated by only 33 million people...but we're workin' on it!!


BP