How do I increase the fuel efficiency of my BWM car?

I recently purchased a BWM car, but I noticed that it consumes a lot of fuel. I've tried driving at a constant speed and maintaining proper tire pressure, but it doesn't seem to make a difference. What can I do to improve its fuel efficiency?

First of all, make sure that your car is up-to-date with its regular maintenance. This includes changing the air filter, spark plugs, and keeping the engine clean. A well-maintained car is more likely to have better fuel efficiency.