How to increase the fuel efficiency of my Vauxhall Insignia?

I recently purchased a Vauxhall Insignia and I have been noticing a decrease in the fuel efficiency. What could be causing this and how can I improve it?

One possible reason for the decrease in fuel efficiency could be dirty fuel injectors. Regular cleaning of the injectors can improve the performance and efficiency of your car's engine.

Another thing to check is the air filter. A dirty air filter can restrict air flow to the engine, causing it to work harder and use more fuel. Replace it if needed.

You can also check your tire pressure regularly. Under-inflated tires can increase fuel consumption, so make sure they are properly inflated according to the manufacturer's specifications.

Consider changing your driving habits as well. Avoid aggressive driving and try to maintain a steady speed. This can greatly improve fuel efficiency.