What is the best way to maintain the Kia ProCeed's fuel efficiency?

I've noticed that my Kia ProCeed's fuel efficiency has been decreasing over time. What steps should I take to ensure that it stays at its optimal level?

Regularly check and replace your air filter to ensure that your engine is receiving the proper amount of air for efficient combustion.

Inflate your tires to the recommended pressure for your vehicle. This can improve fuel efficiency by up to 3%.

Avoid idling for extended periods of time, as this wastes gas. If you need to wait for more than 30 seconds, turn off your engine.

Plan your trips efficiently. Combining multiple errands into one trip can save you gas and time.