DETROIT (AP) - General Motors says its September sales dropped 11 percent from a year ago. Even the company's big pickup trucks saw sales declines, with the Chevy Silverado down almost 11 percent and the GMC Sierra off 2 percent. Industry analysts are predicting that total U.S. auto sales fell about 4 percent because Labor Day weekend was counted in August figures this year The normally strong weekend probably pulled sales from September into August. GM says it sold almost 188,000 cars and trucks last month. The company says its sales to fleet buyers like rental car companies were off 27 percent for the month. GM sold 12,730 Chevrolet Cruze compacts, less than half of what it sold a year ago.