How do I increase fuel efficiency on a Ford Transit Custom van?

I recently purchased a Ford Transit Custom van and I've noticed that my fuel expenses are quite high. Is there anything I can do to increase the fuel efficiency of my van? It's a 2016 model with a 2.2L TDCi diesel engine.

Regularly servicing your van can greatly improve its fuel efficiency. Make sure to follow the recommended service schedule provided by Ford.

Inflate your tires to the correct pressure and keep them properly maintained. Under-inflated tires can cause your van to use more fuel.

Avoid aggressive driving and excessive idling. These habits can greatly decrease your fuel efficiency.