Audi A6 (2016) is 235 mm (9.25 inch) longer and 60 mm (2.36 inch) wider than Opel Astra Sports Tourer (2015).
Opel Astra Sports Tourer (2015) is 80 mm (3.15 inch) higher, 465 kg (1,025 lbs) lighter and has 10 liters (0.35 ft3) bigger cargo space than Audi A6 (2016).
