How can I improve the fuel efficiency on my Vauxhall Insignia?

I have noticed that my Vauxhall Insignia is not getting the fuel efficiency that I expect. What can I do to improve its fuel efficiency?

One suggestion would be to ensure that your tires are properly inflated. Underinflated tires can decrease fuel efficiency. Check your owner's manual for the recommended tire pressure.

Another tip would be to avoid idling for long periods of time. If you're not moving, turn off the engine. Idling burns fuel unnecessarily.

You may also want to consider using a fuel additive or cleaner to improve your engine's performance and fuel efficiency.