Mercedes-Benz USA (MBUSA) reported September sales of 18,779 vehicles, bringing the company’s year-to-date volume to 177,298, a 1.6 percent decrease over its year-to-date record set last year. After its first full year on the market, the new generation C-Class model line set a record for September sales with 6,772 units, an 11.9 percent jump over...