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Old 12-18-2008, 10:42 AM   #1 (permalink)
MetroMPG
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

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90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
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Instead of vacuum gauge: multimeter on MAP sensor

Just had a thought - probably not original:

Instead of buying a vacuum gauge, another option is to wire a cheap multimeter to the MAP (manifold absolute pressure) sensor (if your car has one).



It wouldn't be too hard to drive a little bit and see what voltage corresponds to the lightest load, then use it as a relative indicator of fuel consumption. Very useful if using the DWL (driving with load) technique.

Maybe make a simple LED array that does the same thing, so you don't have to read numbers.

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