With an available diesel V6, the A8 is able to achieve impressive fuel economy for such a large car, while the twin-turbocharged Sport model adds some real performance to the big sedan.. Audi's quattro all-wheel-drive system, standard throughout the lineup, remains an asset for both all-weather handling and performance. When driving an all wheel drive vehicle, such as this Audi A8 L Sport, superior acceleration, traction, and control come standard