If you want comparison sales numbers, insideevs maintains a sales report card. They are accurate to the manufacturers' sales releases. Of course, they have to estimate Tesla's sales. In this matter, I've found my own estimate to be better. I have Tesla at 10200 for the first half of the year. Volt and Leaf are neck-and-neck at 9855 and 9838, respectively. Ford's plug-ins are at 4967.