How to improve BMW X3's fuel efficiency?

I recently bought a BMW X3 and I'm a bit disappointed with its fuel efficiency. Is there any way to improve it without affecting the performance of the car?

First of all, make sure to keep your tires properly inflated. This can greatly improve your fuel efficiency. Also, try to avoid aggressive driving and instead, maintain a steady speed while driving. You can also consider using high-quality synthetic oil for your car as it can reduce resistance and improve fuel efficiency. Lastly, don't forget to regularly maintain your car and replace any faulty parts that may be causing a decrease in fuel efficiency.

In addition to what has already been suggested, you can also try using cruise control on the highway. This can help maintain a constant speed, which in turn, can improve fuel efficiency. Another tip is to avoid idling your car for too long and instead, turn off the engine if you have to wait for more than a minute. And lastly, make sure to keep your car clean as a dirty car can also contribute to decreased fuel efficiency.