BMW 7 Series (2018) is 600 mm (23.62 inch) longer, 114 mm (4.49 inch) wider, 40 mm (1.57 inch) higher and has 214 liters (7.56 ft3) bigger cargo space than Chevrolet Volt (2017).
Chevrolet Volt (2017) is 139 kg (306 lbs) lighter than BMW 7 Series (2018).