BMW 8 Series (G15) (2020) is 256 mm (10.08 inch) longer, 104 mm (4.09 inch) wider and has 15 liters (0.53 ft3) bigger cargo space than Buick Excelle GT (2015).
Buick Excelle GT (2015) is 122 mm (4.80 inch) higher and 599 kg (1,321 lbs) lighter than BMW 8 Series (G15) (2020).
