The United States has replaced OPEC as the marginal petroleum supplier to the world thanks to the shale revolution and improvements in automotive fuel efficiency. Net U.S. imports of crude and products have halved over the last five years, or by an amount equivalent to the entire daily crude exports of Saudi Arabia. Net imports totalled 5.2 million barrels per day at the start of 2014, down from 11.2 million at the beginning of 2009, according to the U.S. Energy Information Administration (EIA). Not one barrel of U.S.