UPDATE 1-Cheap gas, Labor Day weekend drive automakers' U.S. sales in Sept
October 01, 2015 at 11:13 AM EDT
Oct 1 (Reuters) - The big three U.S. automakers - General Motors Co, Ford Motor Co and the U.S. operations of Fiat Chrysler Automobiles NV - reported a jump in September sales on Thursday as cheap gasoline and ultra-low interest rates drove demand for sport utility vehicles and pickup trucks.