BMW 6 Series Gran Turismo (2018) is 809 kg (1,784 lbs) lighter than GMC Sierra 2500HD (2017).
GMC Sierra 2500HD (2017) is 610 mm (24.02 inch) longer, 133 mm (5.24 inch) wider, 437 mm (17.20 inch) higher and has 1109 liters (39.16 ft3) bigger cargo space than BMW 6 Series Gran Turismo (2018).