Audi TTS (2019) is 1558 kg (3,435 lbs) lighter than GMC Sierra 2500HD (2016).
GMC Sierra 2500HD (2016) is 1500 mm (59.06 inch) longer, 69 mm (2.72 inch) wider, 609 mm (23.98 inch) higher and has 1412 liters (49.86 ft3) bigger cargo space than Audi TTS (2019).
