Audi S6 (2018) is 808 kg (1,781 lbs) lighter than GMC Sierra 3500HD (2015).
GMC Sierra 3500HD (2015) is 769 mm (30.28 inch) longer, 161 mm (6.34 inch) wider, 511 mm (20.12 inch) higher and has 1592 liters (56.22 ft3) bigger cargo space than Audi S6 (2018).
