FRANKLIN, Tenn., Sept. 1, 2011 /PRNewswire/ -- Nissan North America, Inc. (NNA) today reported August U.S. sales of 91,541 units versus 76,827 units a year earlier, an increase of 19.2 percent. Â Nissan Division sales increased 22.4 percent for the month with 82,517 units. Sales of...