MINI brand up 16.6 percent year-to-date, best September ever MINI USA reported the best September ever with sales of 4,899 automobiles, an increase of 22.5 percent from the 3,999 sold in September, 2011. Year-to-date, MINI sales in the U.S. are up 16.6 percent on volume of 48,531 compared to 41,635 in the first nine months of 2011.