I haven't noticed any significant increase in mileage when I use it. However, I do it every 6,000 miles or so in conjunction with cleaning the throttle body. Though I do notice smoother idling and acceleration in my car (~195,5xx miles).
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."
- General George S. Patton, Jr
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