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I think this discussion is really about Big Band vs Small Bang. WAI reduces the power of your motor which is just like putting a smaller motor in. Increases in FE come because this forces you to drive slower! At a steady highway speed it takes just as much HP to move your car regardless of the size or state of tune of your motor. Under those conditions your FE is determined solely by the effeciency of your motor. WAI gives you the power of a smaller motor without reducing the inherent losses of the larger one you still have, therefore it is less efficient. I remember years ago reading a mileage expert saying that the way to get better FE is to drive like you have an egg between your right foot and the pedal. I think that if you did an A-B-A test between WAI and CAI in which you controlled the acceleration to match it between tests you would find no advantage to WAI.
That my 2 cents
Mike
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