Audi A6 Allroad (2015) is 242 mm (9.53 inch) longer, 84 mm (3.31 inch) wider and has 25 liters (0.88 ft3) bigger cargo space than Opel Astra Sports Tourer (2020).
Opel Astra Sports Tourer (2020) is 74 mm (2.91 inch) higher and 470 kg (1,036 lbs) lighter than Audi A6 Allroad (2015).
