How to increase fuel efficiency in the Vauxhall Combo Life?

I have noticed that my Vauxhall Combo Life is not as fuel efficient as it used to be. What can I do to improve its fuel efficiency?

Regularly check and replace the air filter. A clogged air filter can decrease fuel efficiency by up to 10%. Make sure to change it every 12,000-15,000 miles.

Avoid aggressive driving and maintain a steady speed. Rapid acceleration and braking can significantly reduce fuel efficiency.

Ensure proper tire pressure. Underinflated tires can decrease fuel efficiency by up to 3%.

Consider using cruise control on highways to maintain a constant speed.

Avoid idling for extended periods of time. It's better to turn off the engine if you anticipate waiting for more than 30 seconds.