The AUDI A6 (2004-09) 5DR AVANT 2.4 V6 SE is a spacious five-door estate, rather than a hatchback or SUV, aimed at buyers wanting executive-car comfort with useful luggage space. In the UK used market, it sits among premium family and long-distance cars, competing with estate versions of the BMW 5 Series and Mercedes-Benz E-Class. Mycarcheck.com has recorded 11 look-ups covering six distinct VINs, so its figures are indications, not a large-scale survey. Across these checks, average private-sale valuation was £800, average recorded mileage was 144,000, and cars averaged about 6,000 miles a year. The average number of previous keepers was around three and a half. The V6 petrol engine gives the A6 Avant a smooth, relaxed feel, and its cabin and boot suit families and commuters. It is not for low fuel bills, so check condition and service history carefully. Against rivals, it offers comfort and practicality.