Alfa Romeo 4C (2017) is 5 mm (0.20 inch) wider and 624 kg (1,376 lbs) lighter than Buick Regal Sportback (2018).
Buick Regal Sportback (2018) is 912 mm (35.91 inch) longer, 271 mm (10.67 inch) higher and has 360 liters (12.71 ft3) bigger cargo space than Alfa Romeo 4C (2017).
