Chevrolet Impala Limited (2015) is 815 mm (32.09 inch) longer, 84 mm (3.31 inch) wider and has 6 liters (0.21 ft3) bigger cargo space than Mazda 6 Atenza (2016).
Mazda 6 Atenza (2016) is 51 mm (2.01 inch) higher and 339 kg (747 lbs) lighter than Chevrolet Impala Limited (2015).
