How to increase the gas mileage of a Vauxhall Vivaro?

I have noticed that my Vauxhall Vivaro's gas mileage is not as good as it used to be. Are there any ways to increase its fuel efficiency?

Regularly check and replace the air filter in your Vauxhall Vivaro. A dirty air filter can greatly diminish gas mileage.

Keep your tires properly inflated. Low tire pressure can cause increased fuel consumption in your Vauxhall Vivaro.

Avoid aggressive driving and heavy acceleration. This can significantly decrease gas mileage in your Vauxhall Vivaro.

Consider installing a more fuel-efficient engine in your Vauxhall Vivaro. It may be a bit of an investment, but it will save you money in the long run.