Audi A6 Avant (2018) is 231 mm (9.09 inch) longer and 38 mm (1.50 inch) wider than GMC Terrain (2014).
GMC Terrain (2014) is 216 mm (8.50 inch) higher, 162 kg (357 lbs) lighter and has 1226 liters (43.30 ft3) bigger cargo space than Audi A6 Avant (2018).