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When I first bought my car it's air intake was missing because of front end damage to the car, so I bought everything I needed to replace it and gained about 3mpg and quited everything down, the only advantage I had not having it was that I could hear the engine better and could tell when I was giving it to much gas so it affected my driving in a way that improved my gas mileage, but installing a scangauge or a vacuum gauge is going to give you better results and more information.
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