BMW 3 Series Gran Turismo (2018) is 140 mm (5.51 inch) longer, 294 mm (11.57 inch) higher and has 100 liters (3.53 ft3) bigger cargo space than McLaren GT (2020).
McLaren GT (2020) is 267 mm (10.51 inch) wider and 164 kg (362 lbs) lighter than BMW 3 Series Gran Turismo (2018).