BMW 6 Series Gran Turismo (2018) is 1091 mm (42.95 inch) longer, 127 mm (5.00 inch) wider and has 349 liters (12.32 ft3) bigger cargo space than BMW i3 (2015).
BMW i3 (2015) is 39 mm (1.54 inch) higher and 550 kg (1,213 lbs) lighter than BMW 6 Series Gran Turismo (2018).