 Shares of AutoNation Inc. AN, -2.79 rallied 1.3 in premarket trading Thursday, after the auto seller reported first-quarter profit and revenue that rose above expectations, as a big beat in sales of used vehicles offset a slight miss in new vehicles. Net income increased to 362.1 million, or 5.78 a share, from 239.4 million, or 2.85 a share, in the year-ago period. 