Core brands have 40.6% gain Detroit Free Press Those brands include Hummer, Pontiac, Saab and Saturn. Retail sales of GM's four core brands, which exclude discounted bulk sales to fleet customers, ... Chevrolet, Buick, GMC and Cadillac Retail Sales Up 3 Percent -- Total Sales ... GM and Ford Report Sales Increase Fuel Efficient Cars and Crossovers Fuel Fourth Month of Chevrolet Sales Increases |