I found the answer,so disregard.: As noted above and in the section on demand, U.S. demand is centered on light products, such as gasoline. As shown in the graph, refiners in the United States more closly match the mix of products demand by using downstream processing to move from the natural yield of products from simple distillation, illustrated earlier, to the U.S. demand slate, illustrated here. After simple distillation alone, the output from a crude oil like Arab Light would be about 20 percent of lightest, gasoline-like products, and about 50 percent of the heaviest, the residuum. After further processing in the most sophisticated refinery, however, the finished product output is about 60 percent gasoline, and 5 percent residuum. The oil companies get the double bonus here. More high priced gasoline from lower priced diesel while at the same time making diesel less available and therefore making it higher priced too
It's always fun to answer my own posts
