Whenever someone raises the subject of some kind of fuel saving gadget, I always head over to
Fuel saving - a professional engineer's view .
Surprisingly, here's what was said about your case:
Quote:
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A device to increase atomisation might provide real benefits on an old carburettor-fuelled vehicle, but not on anything with fuel injection.
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(Source)
As to whether the honeycomb
actually increases atomization though, that's an entirely different question.