You know it's just a giant heater tower....Pricing differentials among the various grades of crude are not nearly as broad as the market differentials.It's also about grade, sweet crude versus stink Mexican crude....Another phenomenon of having U.S. crude stockpiles stranded by lack of infrastructure is the resultant price differential with respect to the West Texas Intermediate (WTI) benchmark. This differential can be as high as $15/barrel. Here in Illinois, it is about $8.40/barrel. This adds up and effects a company's operating revenues. This is serious shit.
Our refineries are primarily configured to process heavy sour crudes. The lighter U.S. grades are blended with the nasty shit before it's introduced into the fractiioning tower.