The ARAI claimed mileage of Audi A6 is 15.26 kmpl. However, the actual mileage totally depends on several factors like driving conditions, road conditions, tyre pressure, etc. In order to improve the mileage, we would suggest you drive slower. Driving fast can reduce your fuel efficiency by up to 33% if you are traveling above 60 mph.
Audi A6 maintenance cost is 3.21 lakh for 5 years but for the exact cost, we would suggest you walk into the nearest authorized service centre as they will be the better people to assist you. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre.