That TrueCar stat seems suspicious. Here's a link to a report on BMW's September sales, USA. The X1 seems to be doing very well.
http://www.prnewswire.com/news-relea...225994431.html
The TrueCar stat may be based on some anomaly. I doubt if Mercedes would be bringing on the GLA and Audi making plans to bring the Q3 if the X1 wasn't doing well.