What is the best way to improve fuel efficiency in a Kia Sportage?

I recently purchased a Kia Sportage and I'm looking for ways to improve its fuel efficiency. What steps can I take to maximize my gas mileage?

Regularly maintain your vehicle by getting tune-ups and oil changes. This can improve your gas mileage by up to 4%.

Avoid aggressive driving and speeding. This can significantly decrease your fuel efficiency.

Check your tire pressure regularly. Underinflated tires can decrease gas mileage by up to 0.3% per 1 psi drop in pressure.

Remove excess weight from your vehicle, such as roof racks. This can improve gas mileage by up to 2%.

Consider using a fuel additive to help clean your fuel system and improve engine performance.