Unless I'm missing something a closed loop map setting should get the same mpg as anyone's closed loop map setting. I get 27mpg straight highway. I should get the same with whatever bolted on as long as I stay in closed loop. My subis were 27mpg also pushing over 330hp to the wheels. Open loop is another story. The fact that your asking about a supercharger is irrelevant, the question should be "with my SC what will my right foot and pedal get me for mpg loss?" If your car weighs the same as a NA car, driving down the highway your mpg's should be identical.
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13 370z-
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