What is the most efficient way to increase fuel efficiency in a Vauxhall Grandland?

I have noticed that my Vauxhall Grandland is not getting as good of gas mileage as it used to. What are some tips and tricks I can follow to increase the fuel efficiency?

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

Avoid aggressive driving such as hard acceleration and braking. This can significantly decrease fuel efficiency.

Maintain proper tire pressure. Under-inflated tires can decrease fuel efficiency by up to 3%. Check your tire pressure regularly.