Buick Regal TourX (2018) is 300 mm (11.81 inch) longer, 52 mm (2.05 inch) wider, 41 mm (1.61 inch) higher and has 120 liters (4.24 ft3) bigger cargo space than Mercedes C-Class (2018).
Mercedes C-Class (2018) is 237 kg (522 lbs) lighter than Buick Regal TourX (2018).