How do I improve the fuel efficiency in my Vauxhall Corsa?

I have noticed that my Vauxhall Corsa's fuel efficiency has decreased over time. Are there any tips or techniques I can use to improve it?

Regularly check and replace your air filter. A clogged air filter can decrease your car's fuel efficiency. Make sure to replace it every 12,000 to 15,000 miles.

Check your tire pressure regularly. Underinflated tires can increase your car's fuel consumption. Make sure to keep your tires inflated to the recommended pressure.

Avoid excessive idling. If you're going to be parked for more than 30 seconds, it's better to turn off your engine. Idling wastes fuel and adds unnecessary wear and tear on your engine.

Use the correct grade of motor oil. Using the wrong type of oil can impact your car's fuel efficiency. Consult your owner's manual to find out which oil is best for your Vauxhall Corsa.