Auto makers rolled out stronger-than-expected December U.S. sales results Wednesday, amid robust demand for trucks and hefty year-end incentives, signaling the industry remained on track to set an annual record in 2016. General Motors Co. logged a 10% rise in U.S. auto sales in the month to 319,108. The company said retail sales rose more than 3% to 249,983 vehicles—its best performance in a decade. Ford Motor Co.’s sales edged 0.1% higher to 237,785. Retail sales gained 5% to 183,454 vehicles for the company’s best December since 2004. Ford said sales of its F-Series pickups posted their best month in 11 years. Fiat Chrysler Automobiles NV, meanwhile, reported sales slipped 10% to 192,519 vehicles, dragged by a planned cutback in daily rental sales. The Italian-U. S. auto maker said retail sales were down 2% while fleet sales were 34% lower. The Ram truck brand turned out a 10% increase […]