What is the most efficient way to maintain my Vauxhall Combo Life's fuel efficiency?

I have noticed a decrease in my Vauxhall Combo Life's fuel efficiency and I am looking for ways to improve it. Can you provide some tips or advice?

Regular maintenance is key to maintaining good fuel efficiency. Make sure to change your oil and air filters at recommended intervals.

Avoid idling your vehicle for extended periods of time. It is more fuel-efficient to turn off your engine and restart it when needed.

Inflate your tires to the recommended pressure. Underinflated tires can decrease fuel efficiency.

Avoid carrying excess weight in your Vauxhall Combo Life, as this can decrease fuel efficiency. Remove any unnecessary items from your vehicle.