How to improve my Vauxhall Grandland's fuel efficiency?

I've been noticing that my Vauxhall Grandland's fuel efficiency has been declining. What could be causing this issue and what steps can I take to improve it?

One possible cause could be a clogged air filter. Make sure to clean or replace it regularly to improve airflow and fuel efficiency.

Check your tire pressure regularly. Underinflated tires can increase fuel consumption, so make sure they are at the recommended pressure.

Avoid idling for extended periods of time. This not only wastes fuel, but also puts unnecessary wear on your engine.

Consider getting a tune-up to ensure your engine is running efficiently. This can also improve fuel efficiency.