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I had wondered about how vacuum gauges help with efficiency myself. I just realized that my car (Subaru WRX) already has one installed! It's my turbo boost gauge - duh. I never really paid much attention to its behavior below 0 until recently. My gauge's units is in MPa (megapascals) instead of inches of mercury, but I found an online converter and found that 15 inHG is about .05 MPa on my gauge. So now I should keep it well under 0 from now on.
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