A fuel injector is like a small nozzle. After a period of time, it can get clogged with deposits and debris from the fuel you use (this decreases both engine performance and efficiency).

While you certainly can put additives in your gas to clean the injectors, it is important to have your mechanic clean your new or used car fuel injector every 20,000 to 30,000 miles or so (we're not all car maintenace pros so don't feel like this is something you should do on your own). Depending on how clogged your fuel injector is, doing so will improve your fuel efficiency, sometimes dramatically.

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