U.S. sales figures for the month of September are in, and Mercedes-Benz USA is reporting that for the month, sales hit their second highest level of the year with 16,985 units sold ? a decrease of 9.6 percent when compared to September 2008. As a result, sales at Mercedes-Benz USA now total 135,413 new units through the first nine months of the year, a 23.6 percent drop when compared to the year prior.