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Were you thinking of applying this to gasoline or diesel engines? If it's gasoline, I can see no benefit. The engine is counting on some external air-in leakage and modulates the idle air control valve to accomodate. If you were to remove this vacuum system air-in leakage, the IAC would just open a bit more to compensate. Even off idle where the IAC has no control with reduced vac system air-in leakage, the throttle would just need to be opened a bit(extremely small amount) more to maintain the same overall manifold pressure.
On the diesel side of things, reducing the volume of air throughput through the vacuum pump may give a slight and perhaps unperceivable efficiency bump. FWIW
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 2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat:
http://forums.tdiclub.com/showthread...=306799&page=4
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