How to improve fuel efficiency on my Volkswagen Polo?

I recently bought a Volkswagen Polo and I noticed that it is not as fuel efficient as I expected. Any tips on how to improve the fuel efficiency?

One way to improve fuel efficiency is to regularly check and replace your air filter. A clogged air filter can reduce fuel efficiency and also cause damage to your engine.

Avoid driving with a heavy foot and maintain a steady speed while driving. Sudden accelerations and braking can decrease fuel efficiency.

Make sure your tires are properly inflated. Under-inflated tires can increase fuel consumption by up to 3%.