The fastest-selling truck in the market now offers an available turbo-diesel engine. The 2016 Chevrolet Colorado Duramax diesel takes midsize truck capability and efficiency to unprecedented levels. With 369 lb-ft of torque (500 Nm) generated by its all-new 2.8L Duramax turbo-diesel, the Colorado’s maximum trailering capacity rises to 7,700 pounds (3,492 kg) on 2WD models,…