Detroit News: President Barack Obama on Friday ordered work to begin on setting first-ever fuel-efficiency standards for heavy-duty trucks. He also called for progress toward establishing higher standards for cars and light trucks in model years 2017 through 2025. “It’s possible in the next 20 years for vehicles to use half the fuel and produce half the pollution that they do today,” Obama said at a Rose Garden ceremony where he signed a presidential memorandum. A 2007 energy law requires …