 TruckTrend Magazine | General Motors' January sales rise, Kansas City-made vehicles post dramatic gains Bizjournals.com The wind-down of GM's Pontiac, Saturn, Saab and Hummer brands made a dent, however, creating a 10 percent gap in overall retail sales, GM said. ... Core brands have 40.6% gain January 2010 Sales: GM Continues to Rebound with Core Brand Sales up 30% GM's US sales up 14% in Jan |