Why is my Ford Ranger experiencing a drop in fuel efficiency?

I've noticed that my Ford Ranger's fuel efficiency has decreased significantly compared to when I first purchased it. I regularly change the oil and perform maintenance, so I'm not sure what could be causing this issue. Any suggestions?

Have you checked your tire pressure? Low tire pressure can decrease fuel efficiency.

It could be a problem with your fuel injectors. I suggest getting them checked by a mechanic.

Is your air filter clean? A dirty air filter can also impact fuel efficiency.