Key specs Audi A6 Station wagon (estate) 2015, 2016; What is the body type, Audi A6 Avant (4G, C7 facelift 2014)? Station wagon (estate), 5 Doors, 5 Seats: What is the fuel economy, Audi A6 Avant (4G, C7 facelift 2014) 3.0 TDI V6 clean diesel (218 Hp) quattro S tronic? 5.3 l/100 km 44.38 US mpg 53.3 UK mpg 18.87 km/l Key specs Audi A6 Station wagon (estate), Crossover 2012, 2013, 2014; What is the body type, Audi A6 Allroad quattro (4G, C7)? Station wagon (estate), Crossover, 5 Doors, 5 Seats: What is the fuel economy, Audi A6 Allroad quattro (4G, C7) 3.0 TDI V6 clean diesel (245 Hp) quattro S tronic? 6.3 l/100 km 37.34 US mpg 44.84 UK mpg 15.87 km/l But consider this: The 1986 Audi 5000 CS Turbo Quattro made 158 hp and 166 lb-ft from a 2.2-liter five-cylinder engine, got 20 mpg on the highway when fitted with the three-speed automatic (24 mpg lGN3i.