BMW 5 Series Gran Turismo (2015) is 508 mm (20.00 inch) longer, 113 mm (4.45 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 473 kg (1,043 lbs) lighter than BMW 5 Series Gran Turismo (2015).