 In 2014 the Leaf took the sales lead, with 30,200 units sold, with the Volt ranking second with 18,805, followed by the Model S with 16,689 units.The Tesla Model S, with 25,202 units delivered, was the top selling plug-in car in 2015, followed by the Nissan Leaf with 17,269 units, and the Volt with 15,393.Again in 2016, the Model S was the best selling plug-in car with about 29,156 units delivered, followed by the Volt with 24,739, and the Model X with about 18,028.