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I wouldn't call that an electric supercharger. I have read about that in the past. Maybe even here. Basically it's a 900 watt fan that is supposed to blow more air into your intake manifold. Similar to ram air.
It certainly wouldn't get you any better fuel economy directly. It is supposed to run only at full throttle for added power accellerating. In principle, it should provide more power in short bursts, say for merging with fast moving traffic in cars with very small engines.
I would guess that when it's not running the induced restriction in the intake tract would hurt fuel economy some. I don't think anyone here is going to chance the $200 to find out.
Don
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