sentences:  The series plug-in hybrid will use a new hybrid system, dubbed e-Power, which debuted with the Nissan Gripz concept crossover showcased at the 2015 Frankfurt Auto Show.Chevrolet Volt sales in the American market passed the 100,000 unit milestone in July 2016, the first plug-in vehicle in the U.S. to achieve that mark.More than 122,000 light-duty plug-in hybrids were sold during the first half of 2016. , about 640,000 highway legal plug-in hybrid electric cars have been sold worldwide since December 2008, out of total global sales of over 1.5 million light-duty plug-in electric cars.