By Ellen Knickmeyer and Tom KrisherThe Associated PressWASHINGTON — The Trump administration’s rollback of mileage standards Tuesday marks a win for Americans who like their SUVs and pickup trucks, but the government’s own estimates show big costs, too — more Americans dying from air pollution, more climate-damaging tailpipe exhaust and more expense for drivers at the gas pumps. The administration’s final rule relaxes future mileage standards for years to come, gutting tougher Obama-era standards that were the U.S.