BMW 6 Series Gran Coupe (2016) is 41 mm (1.61 inch) wider than Chevrolet Impala (2018).
Chevrolet Impala (2018) is 104 mm (4.09 inch) longer, 104 mm (4.09 inch) higher, 256 kg (564 lbs) lighter and has 74 liters (2.61 ft3) bigger cargo space than BMW 6 Series Gran Coupe (2016).