How does the Audi A6 achieve its high fuel efficiency?

I've heard that the Audi A6 is a fuel-efficient car but I'm not sure how it's achieved. Can someone explain the specific technologies or features that the Audi A6 uses to achieve its high fuel efficiency?

The Audi A6 uses a combination of advanced engine technologies, such as direct injection and start-stop systems, as well as lightweight materials and aerodynamic design to achieve its impressive fuel efficiency. With these features, the A6 is able to reduce fuel consumption without sacrificing performance.

As a proud owner of an Audi A6, I can attest to its fuel efficiency. The car utilizes a regenerative braking system that helps to recharge the battery and improve fuel economy. Additionally, its seven-speed S tronic transmission helps to optimize gear shifts for smoother and more efficient driving.

The Audi A6 also features an innovative thermal management system that optimizes the engine temperature for better fuel efficiency and reduced emissions. This system makes use of a rotary valve that controls the flow of coolant to different parts of the engine based on their temperature needs.