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

I've noticed that my Vauxhall Corsa's fuel efficiency isn't as good as it used to be. What can I do to improve it?

Regularly check and replace your air filter. A dirty air filter can decrease fuel efficiency.

Maintain proper tire pressure. Under-inflated tires can cause your car to use more fuel.

Avoid excessive idling. Turning off your engine instead of idling can save fuel.

Use cruise control on long drives. This can help maintain a consistent speed and improve fuel efficiency.