Why does my Ford Fiesta have poor fuel efficiency?

I recently purchased a Ford Fiesta and I'm noticing that I have to fill up the fuel tank more often than expected. What could be causing this and how can I improve my fuel efficiency?

One reason for poor fuel efficiency could be dirty or clogged fuel injectors. It's recommended to have them cleaned every 30,000 miles.

Check your tire pressure regularly. Underinflated tires can decrease fuel efficiency.

Avoid idling for long periods of time and try to combine short trips into one longer trip. This can save fuel.