National Highway Safety Transportation Administration chief Mark Rosekind said the nation’s fuel efficiency mandate isn’t going to be sacrificed because gasoline has fallen to a six-year low in the U.S. Reuters Auto makers are on a collision course with U.S. regulators over the timetable to achieve stringent fuel-economy standards as cheap gasoline sends consumers flocking to less-efficient pickup trucks and sport-utility vehicles. Car companies are laying the groundwork to seek some relief when the targets come up for review by regulators in 2017, executives said at the North American International Auto Show in Detroit. They are in some cases already canvassing the White House, Capitol Hill and regulatory agencies to start lobbying for possible changes to fuel economy standards that take effect in 2022. The mileage targets, known as corporate average fuel economy, or CAFE, call for auto makers to sell a portfolio of light-duty cars and trucks averaging […]