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Actually, I thought that most cars idle at 15-20 vacuum, WOT at around vacuum of 5, and decell at 30ish+. I think that your thinking of a car that's turbo-charged, in which case the psi (boost) will go up during accel, and down during decel, opposite with vacuum.
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I was talking about absolute pressure in PSI (how Scanguage displays it), not in/hg. atmospheric= ~14.7 psi, perfect vacuum= 0psi. It's called absolute pressure because it's relative to an absolute vacuum. A typical boost gauge will be relative to atmospheric, which means a total vacuum would be -14.7 psi, atmospheric would be 0, and then boost in positive numbers.