How does the Audi A8 reduce air resistance?

I've heard that the Audi A8 has a particularly aerodynamic design. What measures does Audi take to reduce air resistance in this model?

The Audi A8 has a sleek and streamlined exterior design, reducing drag and air resistance. Additionally, it features an active air suspension system which can lower the car's ride height at higher speeds to improve aerodynamics.

The Audi A8 also features active grille shutters that automatically close at higher speeds to decrease drag and improve fuel efficiency. These shutters open at lower speeds to ensure proper engine cooling.