The reason that this would show some improvement at all is that it is feeding vaporized fuel in to the engine, granted it is only a small amount but it is there and vaporized fuel is going to burn quickly and help to speed flame spread, so there is something behind his idea, same idea as heating your fuel, only he is boiling his fuel by putting it under a vacuum.
but as I said before, when you do this you end up with the less volitial parts of the fuel being left behind, so you end up with a tank of varnish and goo.
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