How can I improve my Toyota Hilux's gas mileage?

I have a 2015 Toyota Hilux and I've noticed that my gas mileage has been decreasing lately. What could be causing this and what steps can I take to improve it?

One possible cause could be a dirty air filter. You can improve your gas mileage by regularly changing your air filter.

Another possible cause could be under-inflated tires. Check your tire pressure regularly and inflate them to the recommended level to improve gas mileage.

You may also want to consider using a fuel injector cleaner to help improve gas mileage. It can clean out any debris or buildup in your fuel system.