General Motors Corp.'s sales sagged in June as demand for its small cars dropped. Also, aggressive discounting by the Toyota Motor Corp. injured GM’s pickup trucks. Of the Detroit Big Three, GM suffered the largest monthly decline, with sales diving 21.3 percent - the number is slightly weaker than June last year.
Overall, vehicle sales fell three percent from year-earlier levels, and the drop would have been sharper if there had not been an extra selling day in June. On a seasonally...