BMW 4 Series (2020) is 270 mm (10.63 inch) longer, 64 mm (2.52 inch) wider, 121 kg (267 lbs) lighter and has 140 liters (4.94 ft3) bigger cargo space than Chevrolet Volt (2017).
Chevrolet Volt (2017) is 55 mm (2.17 inch) higher than BMW 4 Series (2020).