Audi TTS (2017) is 17 mm (0.67 inch) wider than Opel Astra Sports Tourer (2017).
Opel Astra Sports Tourer (2017) is 507 mm (19.96 inch) longer, 194 mm (7.64 inch) higher, 5 kg (11 lbs) lighter and has 200 liters (7.06 ft3) bigger cargo space than Audi TTS (2017).
