BMW i8 (2016) is 1155 kg (2,546 lbs) lighter than GMC Sierra 3500HD (2018).
GMC Sierra 3500HD (2018) is 1010 mm (39.76 inch) longer, 93 mm (3.66 inch) wider, 684 mm (26.93 inch) higher and has 1837 liters (64.87 ft3) bigger cargo space than BMW i8 (2016).