U.S. light-vehicle sales probably rose in December to wrap up a three-year run unrivaled in almost four decades as consumers replaced cars and trucks that are, on average, the oldest ever on the nation’s roads. Car and light truck sales in the U.S. probably rose 9.8 percent in December, according to a Bloomberg survey of analysts. That would cap a third-straight annual gain of at least 10 percent, the first such industry streak since 1973. “It sure feels a lot better to be selling cars today than a few years ago,” Geoffrey Pohanka, president of the Pohanka Automotive Group, said in a telephone interview. “The age of ... (full story)