Audi A6 Avant (2017) is 305 mm (12.01 inch) longer, 50 mm (1.97 inch) wider, 99 mm (3.90 inch) higher and has 120 liters (4.24 ft3) bigger cargo space than BMW 4 Series (2014).
BMW 4 Series (2014) is 105 kg (231 lbs) lighter than Audi A6 Avant (2017).
