How to increase the fuel efficiency of my Vauxhall Combo Life?

I recently bought a Vauxhall Combo Life and I've been noticing that its fuel efficiency is not as good as I expected. Is there anything I can do to improve it?

Regularly check and replace your air filter to keep your engine running smoothly and efficiently.

Make sure your tires are properly inflated. Underinflated tires can decrease your fuel efficiency.

Avoid excessive idling and try to combine multiple short trips into one longer trip.