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

I have a Vauxhall Insignia and have noticed that it is not getting the best fuel efficiency. Any tips or advice on how I can improve it?

Make sure to regularly check and change your air filter. A dirty air filter can decrease fuel efficiency by up to 10%.

Avoid aggressive driving and speeding. This can greatly reduce your fuel efficiency.

Consider using cruise control on long highway drives to maintain a consistent speed and improve fuel efficiency.

Make sure your tires are properly inflated. Underinflated tires can decrease fuel efficiency by up to 3%.