How can I improve the fuel efficiency for my Kia ProCeed?

I recently purchased a Kia ProCeed and have noticed that I am not getting as good of fuel efficiency as I was expecting. What are some tips or modifications I can make to improve the fuel efficiency?

Regularly check and replace your air filter as a clogged filter can decrease fuel efficiency.

Avoid aggressive driving habits such as speeding and quick accelerations as this can greatly decrease fuel efficiency.

Consider using a fuel additive to clean out the engine and improve fuel efficiency.