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Ive used it in my oil and fuel and went from a 18 mpg to 21 mpg and i usually baby the car i dont do hard take offs or nothing that would force the engine too much. Also i usually drive the same amount of miles on freeway and in the city. But i guess it just depends on if your car really needs a cleaning or not. If theres no carbon deposites or any type of gunk then the seafoam really ain't gonna do much.
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