Buick LaCrosse (2016) is 3 mm (0.12 inch) wider and 8 mm (0.31 inch) higher than Chevrolet Impala (2014).
Chevrolet Impala (2014) is 112 mm (4.41 inch) longer, 43 kg (95 lbs) lighter and has 156 liters (5.51 ft3) bigger cargo space than Buick LaCrosse (2016).