How to increase fuel efficiency on my Vauxhall Movano?

I have noticed that my Vauxhall Movano is not as fuel efficient as it used to be. What are some tips and tricks to increase its fuel efficiency?

Regularly check tire pressure to ensure they are properly inflated. This can improve fuel efficiency by up to 3%.

Consider using a fuel additive to clean out any buildup in the fuel system. This can improve fuel efficiency and engine performance.

Avoid excessive idling and drive at a consistent speed. Sudden acceleration and braking can use up more fuel.