Audi A6 Avant. 2018 - Present Height: + 22 mm. Width: + 39 mm. Length: + 177 mm. Boot Space + 35L. View Car. The Audi A6 Avant (2018) is 1457 mm high, 1886 mm wide and 4939 mm long. The boot capacity is 530 litres Dimensions of New and Used Audi A6 Avant cars. Compare length, height, width and boot space with other vehicle brands, makes and models. ^{Audi Guard Cargo Mat +$170: Audi Cargo Box +$85: Audi Guard All-Weather Floor Mats +$200: Audi Guard Protection Kit +$320: Audi Beam-Rings +$275: Audi First Aid Kit +$50: Stainless Steel Pedal} .