Audi A8/S8 - Wiring Diagrams - auto-manual The appetite of the engine corresponds to its power and stunning dynamic characteristics. Fuel consumption Audi S8 is 13.7 liters of gasoline per hundred kilometers at a city pace with frequent acceleration and braking, 7.9 liters during a measured trip on the country road and 10 liters of fuel per hundred in a mixed cycle of traffic. Fuse box diagram Audi A8 (D3) Fuse and relay location. Fuse box diagram. Identifying and legend fuse box Audi A8 2002-2009.