Ford and General Motors are feuding over a Chevy Silverado ad that aired during the Super Bowl last night. The head of the giant dealership group, Group 1 Automotive, says new car sales only account for 20 to 25 percent of a dealer’s profits. Chinese car exports are expected to grow by 50 percent this year. All that and more, plus a look at the styling of the Chevy Malibu Eco.