Audi A3 (Sedan) (2016) is 430 kg (948 lbs) lighter than Audi A6 Avant (2017).
Audi A6 Avant (2017) is 485 mm (19.09 inch) longer, 79 mm (3.11 inch) wider, 45 mm (1.77 inch) higher and has 140 liters (4.94 ft3) bigger cargo space than Audi A3 (Sedan) (2016).
