How to improve gas mileage in a Vauxhall Movano?

I have a Vauxhall Movano that I use for work and I've noticed that it's not getting as many miles per gallon as it used to. Is there anything I can do to improve its gas mileage?

Regularly check and replace air filters to ensure proper air flow for fuel combustion.

Keep your tires properly inflated to reduce rolling resistance and increase fuel efficiency.

Avoid excessive idling and maintain a steady speed while driving to prevent unnecessary fuel consumption.