BMW 5 Series Gran Turismo (2018) is 445 mm (17.52 inch) longer, 80 mm (3.15 inch) wider, 29 mm (1.14 inch) higher and has 230 liters (8.12 ft3) bigger cargo space than Opel Ampera (2017).
Opel Ampera (2017) is 42 kg (93 lbs) lighter than BMW 5 Series Gran Turismo (2018).