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Originally Posted by hat_man
I'm not really sure exactly what vacuum's function is in an engine either.
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Apart from some older ignition systems that relied on vacuum to variate the timing, I don't remind any other utility for it in the engine. Well, on the other hand it does work as a power source for brake servos and other auxiliary systems...
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IIRC low vacuum is the engine running more efficiently right?
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Low vacuum is a result of fewer restrictions at the intake, such as a wide-open throttle valve, thus the engine in fact runs more efficient because it has to do fewer work to intake a given amount of air (leading to smaller "pumping losses").