Stronger than expected auto sales in February fueled a stock market rally. Low gas prices, easy credit and the calendar quirk that is Leap Day helped boost sales. There also were February sales along the Atlantic seaboard that were deferred from January when a massive winter storm hit that region and caused some dealerships to close for several days. "The impact of millennials is significant, too," said Eric Lyman, vice president for industry insights at TrueCar.com. "They’re getting jobs and getting out of the parents’ houses."