4. When did you last change your air filter?

Ever breath through a surgical mask? Not very comfortable. Your car breathes through something similar all the time, because it really doesn’t want to inhale any dirt. Air filters are cheap and checking them is easy – most air filters sit on top of the engine for easy access. Take a look at it – if it’s dirty, replace it. You might improve your mileage by as much as 10%.

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