Chevrolet Impala (2017) is 719 mm (28.31 inch) longer, 58 mm (2.28 inch) wider and has 12 liters (0.42 ft3) bigger cargo space than Mazda 6 Atenza (2020).
Mazda 6 Atenza (2020) is 71 mm (2.80 inch) higher and 258 kg (569 lbs) lighter than Chevrolet Impala (2017).
