http://cleantechnica.com/2016/01/15/1-large-luxury-car-in-us...
"As we all know, Tesla doesn’t report sales/deliveries by country. However, various outlets estimate Tesla sales using a variety of methods. EV Obsession estimated 26,566 Tesla Model S sales in the US in 2015. Rob notes that the lowest estimate was 24,200. In either case, the Model S outsold the Mercedes S-Class, the BMW 7-Series, the BMW 6-Series, the Audi A7, the Audi A8, the Porsche Panamera, and every other car in this class."