How to increase fuel efficiency in the Kia Rio?

I have been noticing that my Kia Rio is not as fuel efficient as it used to be. What are some tips to improve its mileage?

Maintain regular tire pressure - under-inflated tires can decrease fuel efficiency by up to 3%

Avoid aggressive driving - sudden accelerations and braking can reduce fuel efficiency by up to 33%

Use cruise control on the highway - maintaining a constant speed can improve fuel efficiency

Replace air filter regularly - a dirty filter can decrease fuel efficiency by up to 10%