How to improve gas mileage in a BWM 3 series?

I have a BWM 3 series and I want to know what I can do to improve its gas mileage. Is there anything I can do myself or do I need to take it to a mechanic?

First, make sure your tires are properly inflated. Under- or over-inflated tires can significantly decrease your gas mileage. You can check the recommended tire pressure for your specific vehicle in the owner's manual.

Another simple way to improve gas mileage is to avoid aggressive driving. Constantly accelerating and braking can use up a lot of fuel. Try to maintain a steady speed and anticipate traffic to maximize your fuel efficiency.