What is the most efficient way to improve fuel efficiency in my Vauxhall Crossland?

I've noticed that my Vauxhall Crossland is not getting the fuel efficiency it used to. What steps can I take to improve its efficiency and save on gas costs?

Regularly check and replace air filters to ensure proper air flow and engine efficiency.

Maintain proper tire pressure to reduce resistance and improve fuel efficiency.

Avoid idling for extended periods of time, turn off the engine when possible to save fuel.

Use cruise control on highways to maintain a consistent speed and reduce fuel consumption.