Why does the Audi A8 have a higher fuel consumption compared to other luxury sedans?

I have noticed that the Audi A8 has a higher fuel consumption than other luxury sedans in its class. Is this due to the all-wheel drive system or are there other factors at play? Based on my research, it seems to be a recurring issue among A8 owners.

The higher fuel consumption in the Audi A8 is due to a combination of factors, including its all-wheel drive system, larger size, and less aerodynamic design compared to other luxury sedans. However, with proper maintenance and driving habits, you can still get decent fuel efficiency from the A8.