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As mentioned above the pump operates via a belt drive and creates a relative vacuum in the crankcase. The power required is not a lot but there needs to be some sort of separator catch can for the vapour from the oil.
This in normally a metal cylinder with a drain back to the crankcase and a vent to atmosphere and the associated valving to make sure it all operates as it should.
Not a lot of weight but some space required to house it all.
For the MPG side there would probably be some gains but if the extra complexity (and costs) are worth it that is a question for the owner to sort out.
Interesting thread.
Cheers , Pete.
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