DETROIT, Mich (WLMI) General Motors is reporting a 16-percent gain in June sales when compared to 2011.  The popularity of the Chevrolet Malibu was evident last month as sales jumped by 32-percent.  The Buick LaCrosse was also a hit gaining 21-percent is sales compared to one-year ago. Ford posted a seven-percent increase—Chrysler a 20-percent jump.