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That is typically what I see: max vacuum at idle of maybe 18 inches, zero at WOT, maybe 10 or so on the highway. Of course, getting off the throttle and coasting down can get it to maybe 25 inches or so.
This brings back fond memories of my long, long ago youth, when cars had vacuum-motivated windshield wipers. Typical scene: you're moving along at 60 mph on a two-lane road in a rain and come up to a guy moving at 50. So, you floor the go-peddle to pass him, and the windshield wipers freeze in place because there's no vacuum to operate them.
Passing blind on two-lane roads was a hoot.
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