U.S. consumers weren't buying many vehicles last month, as the major automakers saw big year-over-year declines in car and truck sales. General Motors ( GM) said Monday that it sold 170,585 vehicles in October, 45% lower than a year ago. Truck sales of 97,119 were down 51%, and car sales dropped 34% to 73,466. Ford ( F) said its sales slumped 30.2% from the same month a year ago to 132,838 vehicles. In October 2007, the company sold 190,195 cars and trucks. Truck sales fell 30.3% to 88,267 units, and Ford, Lincoln and Mercury car sales slid nearly 27% to 40,854. At Toyota ( TM) light-vehicle sales decreased more than 20% to 152,101.