Why is my Ford Puma's fuel efficiency decreasing?

I recently purchased a Ford Puma and I noticed that its fuel efficiency has decreased significantly. I have been following proper maintenance routines and using the manufacturer recommended fuel. What could be the cause of this decrease?

It could be due to a clogged air filter or a faulty oxygen sensor. Both of these can affect the air-fuel ratio and result in decreased fuel efficiency.

Have you checked your tire pressure? Under-inflated tires can also contribute to decreased fuel efficiency. Make sure to regularly check and adjust your tire pressure according to the manufacturer's recommendations.

Another factor could be the way you drive. Avoid aggressive acceleration and braking, and try to maintain a steady speed. This can improve your fuel efficiency.