Great article on the CME website discussing US crude dynamics & that the WTI/Brent spread is not the only spread to watch. Focus is on the Louisana light & sweet grade vs WTI.
http://openmarkets.cmegroup.com/5445/wtibrent-isnt-the-only-crude-oil-spread-to-watch
http://openmarkets.cmegroup.com/5445/wtibrent-isnt-the-only-crude-oil-spread-to-watch