Buick LaCrosse (2018) is 600 mm (23.62 inch) longer and 132 mm (5.20 inch) wider than Chevrolet Sonic (Sedan) (2016).
Chevrolet Sonic (Sedan) (2016) is 55 mm (2.17 inch) higher, 315 kg (694 lbs) lighter and has 17 liters (0.60 ft3) bigger cargo space than Buick LaCrosse (2018).