Vehicle sales by General Motors (GM) and its joint ventures in China increased 15.3% year on year last month to an April record of 261,870 units.Vehicle sales by General Motors (GM) and its joint ventures in China increased 15.3% year on year last month to an April record of 261,870 units.Vehicle sales by General Motors (GM) and its joint ventures in China increased 15.3% year on year last month to an April record of 261,870 units.