BMW 5 Series Gran Turismo (2016) is 315 mm (12.40 inch) longer, 266 mm (10.47 inch) higher and has 346 liters (12.22 ft3) bigger cargo space than BMW i8 (2016).
BMW i8 (2016) is 41 mm (1.61 inch) wider and 355 kg (783 lbs) lighter than BMW 5 Series Gran Turismo (2016).