How can I improve my Vauxhall Crossland's fuel efficiency?

I recently purchased a Vauxhall Crossland and have noticed that it's not getting great gas mileage. What steps can I take to improve its fuel efficiency?

Regularly check and replace your air filter. A dirty air filter can decrease fuel efficiency by up to 10%.

Inflate your tires to the recommended pressure. Underinflated tires can decrease fuel efficiency by up to 5%.

Avoid idling for long periods of time. If you're going to be stopped for more than a minute, turn off the engine.