The new Chevrolet Camaro ZL1 is on display at the Chicago Auto Show on Wednesday, Feb. 9, 2011, in Chicago. General Motors' U.S. car and truck sales jumped 49 percent in February, aided by sweeter financing and lease deals. (AP Photo/Charles Rex Arbogast)

Photo by: Charles Rex Arbogast

The new Chevrolet Camaro ZL1 is on display at the Chicago Auto Show on Wednesday, Feb. 9, 2011, in Chicago. General Motors' U.S. car and truck sales jumped 49 percent in February, aided by sweeter financing and lease deals. (AP Photo/Charles Rex Arbogast)