Chevrolet earned its second consecutive Manufacturer Championship in the IMSA WeatherTech SportsCar Championship's GT Le Mans (GTLM) category Saturday at Road Atlanta. A second-place finish in the 10-hour Petit Le Mans for the No. 3 Mobil 1/SiriusXM Chevrolet Corvette C7.R gave Chevrolet its 12th GT Manufacturer title dating back to...