Why is my Volkswagen Touareg's fuel efficiency decreasing?

I've noticed that my Volkswagen Touareg is not getting the same level of fuel efficiency as when I first bought it. What could be causing this? Is it something I should be concerned about?

It's important to regularly check and properly inflate your tires to improve fuel efficiency.

Are you driving in stop-and-go traffic often? This can significantly decrease fuel efficiency.

You may want to consider getting a tune-up for your car to improve its overall performance and fuel efficiency.