How to improve fuel efficiency on my Vauxhall Movano?

I have been using my Vauxhall Movano for commercial purposes and have noticed a significant decrease in fuel efficiency. What steps can I take to improve the fuel efficiency of my vehicle?

Regularly check and replace air filters. Clogged air filters can cause the engine to work harder and use more fuel.

Avoid overly aggressive driving. Quick acceleration and braking can use up a lot of fuel.

Consider using a fuel additive. These can help improve engine performance and increase fuel efficiency.

Check tire pressure regularly. Under-inflated tires can increase fuel consumption.

Avoid idling for long periods of time. This is a waste of fuel and adds unnecessary wear and tear on the engine.