BMW 3 Series Gran Turismo (2021) is 142 mm (5.59 inch) longer, 295 mm (11.61 inch) higher and has 101 liters (3.57 ft3) bigger cargo space than McLaren GT (2020).
McLaren GT (2020) is 266 mm (10.47 inch) wider and 9 kg (20 lbs) lighter than BMW 3 Series Gran Turismo (2021).