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Before computers and O2 sensors on cars I know some fuel saving gadgets did bleed air in with the crank case gases to lean out the mixture. These devices had minor improvements to economy and reduce unburnt HC and CO but tended to increase NOx. Their improvements were nothing like the claims these guys are making.
IF what this does improves air flow through the PCV valve then a minor improvement will be made by the increased vacuum in the crank case. This is because the bottom of the pistons aren't moving as much air around in the crankcase. There will not be as big of benefit as these guys are claiming though.
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