What does the Kia Rio's overdrive do?

I noticed my Kia Rio has an overdrive button, what does it do and when should I use it?

The overdrive feature on your Kia Rio allows for a higher gear ratio which can improve fuel efficiency. You should use it when cruising at high speeds or on flat, open roads.

Overdrive helps the engine avoid working too hard at high speeds which can save your fuel and engine life.

Using overdrive can also improve the overall performance of your Kia Rio and make it more fun to drive.