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I'm not very familiar with MPGuino but when paired with the vacuum gauge I assume you could take a know trip (on the way to work?) accelerating at X vacuum and check to see what your trip MPG is; then try it again at a different vacuum reading and compare until you find your car's sweet spot. Shift RPM will come into play too so pick a reasonable RPM and try to shift at it every time in order to eliminate that factor as much as possible. This is all just a guess but it seems like it could work...
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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