AUBURN HILLS (WKZO) -- Chrysler's August sales figures are up 31-percent over a year ago, marking the best August for the automaker since 2007. August also represented Chrysler's 17th consecutive month of year-over-year sales growth.  Chrysler Group's car sales increased 23 percent in August, while the group's truck sales were up 33 percent compared with the same month a year ago.