How to improve the fuel efficiency of a Vauxhall Insignia?

I'm looking for tips and tricks to increase the fuel efficiency of my Vauxhall Insignia. I'm not sure what factors affect fuel consumption the most, so any advice would be greatly appreciated.

To improve the fuel efficiency of your Vauxhall Insignia, make sure to keep up with regular maintenance and servicing. This includes air filter changes, oil changes, and tire rotations. Also, try to avoid rapid acceleration and excessive idling. These can both use up more fuel than necessary.

Another way to improve fuel efficiency is to drive at a consistent speed and avoid excessive braking. This can help prevent unnecessary fuel consumption. Additionally, keep your car's weight to a minimum by removing any unnecessary items from your car.

Consider using fuel additives or high-quality fuel to improve your car's performance and fuel efficiency. These can help clean your engine and improve its overall efficiency. Also, make sure your tires are properly inflated as under-inflated tires can decrease fuel efficiency.