The problem is, there is a global oil refinery capacity shortage, and the US is not adapting as it should.  In five decades, no major infrastructure has been added.  This means that as aging plants shut down, or as they are closed down due to state policies, US refining capacity will continue to fall and the ceiling for supply vs demand will get tighter and tighter. 

The point is, there are obvious fixes available, but nothing will happen until disaster strikes and politicians are effectively frightened.

https://www.zerohedge.com/energy/us-doesnt-have-oil-problem-it-has-refinery-problem