BMW 5 Series Gran Turismo (2016) is 506 mm (19.92 inch) longer, 114 mm (4.49 inch) wider, 120 mm (4.72 inch) higher and has 200 liters (7.06 ft3) bigger cargo space than Opel Ampera (2014).
Opel Ampera (2014) is 258 kg (569 lbs) lighter than BMW 5 Series Gran Turismo (2016).