BMW 6 Series Gran Turismo (2019) is 104 mm (4.09 inch) longer, 40 mm (1.57 inch) wider, 56 mm (2.20 inch) higher and has 9 liters (0.32 ft3) bigger cargo space than Buick Regal TourX (2018).
Buick Regal TourX (2018) is 113 kg (249 lbs) lighter than BMW 6 Series Gran Turismo (2019).