What are the potential causes of poor fuel efficiency in a Kia Sportage?

I have noticed that my Kia Sportage's fuel efficiency has significantly decreased recently. What could be causing this issue and what steps should I take to improve it?

One potential cause of poor fuel efficiency in a Kia Sportage could be a clogged air filter. This can restrict airflow to the engine and reduce fuel economy. It is recommended to check and replace the air filter regularly to avoid this issue.

Another possible cause could be under-inflated tires. This can create more resistance on the road and lead to lower fuel efficiency. Make sure to regularly check and adjust your tire pressure to the recommended level.

A malfunctioning oxygen sensor can also contribute to poor fuel efficiency. This sensor measures the amount of oxygen in the exhaust and helps regulate the fuel and air mixture. If it is not working properly, it can lead to reduced fuel efficiency. It is recommended to have it checked and replaced if necessary.