After you've been in a Stage III car you wont be conserned about turning off the supercharger. When your cruising the by-pass opens anyway. The S/C doesnt seem to hurt the gas mileage that much. I've dropped about 3 to 4 MPG, but I also switched over to the JDM 6-speed tranny also. I believe most if not all of the MPG I lost is do to the different gearing.
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