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

I've noticed that my Vauxhall Astra's fuel consumption has been higher than usual. How can I decrease my fuel consumption without sacrificing performance?

Firstly, make sure your tires are properly inflated. Underinflated tires can increase fuel consumption.

Next, look into getting a tune-up for your engine. This can improve fuel efficiency by up to 4%.

Consider using a fuel additive to help clean out any deposits in your fuel system.

Adjust your driving habits to be more fuel-efficient. This includes avoiding harsh acceleration and braking, using cruise control on highways, and staying within the speed limit.

Finally, keep up with regular maintenance such as oil changes and replacing air filters. A well-maintained car can be more fuel-efficient.