BMW 4 Series (2016) is 8 mm (0.31 inch) wider and 97 kg (214 lbs) lighter than Buick Regal TourX (2018).
Buick Regal TourX (2018) is 288 mm (11.34 inch) longer, 100 mm (3.94 inch) higher and has 155 liters (5.47 ft3) bigger cargo space than BMW 4 Series (2016).
