How often should car air filter be changed and can it really save that much gas at all?

every year. it is alot cheaper than buying more gas

check it at every oil change. Change it if it looks dingy. They’re not that expensive, so when in doubt, change it.

You can get washable, reusable ones, but they’re only worth it if you plan on having the car a loooong time.

Some owner’s manuals say that under “normal” service, the air filter lasts 25,000 miles typically. Hold the filter up to the sun or a strong lightbulb and you should see some light come through. Ideally, purchase a “green” renewable (cleanable) K&N, Fram or other filter that can be washed and reoiled as often as you like!

whenever it it show signs of dirt. what could of air do you like breathing??clean air just like your motor wants a dirty filter will diffently choke up you motor.