While federal law bars overseas shipments of most U.S.-produced oil, refiners can export petroleum products created from that crude, including gasoline, diesel and jet fuel.In July, U.S. refiners shipped a record 3.8 million barrels of products a day to places as far flung as Africa and the Middle East, according to the monthly data from the Energy Information Administration. That volume is nearly 65% above the 2010 export level, when the U.S. oil boom was still in its infancy.
