HERNDON, VA -- Audi of America announced today auto sales for the month of September totaling 7,584, a decrease of 5.4% from last year's figures. Audi new vehicle sales fell 3.9% year-to-date as the company faces stronger economic headwinds. Audi Certified Pre-Owned (CPO) sales decreased by 10.6% compared to last year's September figures, although sales continued to grow year-over-year at 31.0%.