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The relationship is dependent on the engine and drive line.
Vacuum developed tells you how inefficient your engine is.
The idea is a vacuum reading too close to atmospheric pressure on a normal engine means you are wasting fuel.
I think the idea is you put the car in top gear and the vacuum gauge acts like an engine load indicator.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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