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MPG Observation (Calc vs Display)

Discussion in 'Gen 2 Prius Fuel Economy' started by wjtracy, Sep 18, 2012.

  1. wjtracy

    wjtracy Senior Member

    Joined:
    Sep 19, 2006
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    Location:
    Northern VA (NoVA)
    Vehicle:
    Other Hybrid
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    Lately we have been doing some trips.
    We are re-filling ~1o.o gals gasoline each time, and we are getting ~460 miles per tankful so that is ~46 MPG on my excel calc spreadsheet.

    However, the MFD display tends to be showing a nice-to-see 50 MPG average. But sometimes after gaso fill-ups and hitting Reset, the MFD display ticks immediately down to 46-47 which seems to be a disappointing sudden loss of MPG, but on sencond thought, the 46-47 figure is closer to the calc number.

    So I am thinking the MFD display may have a tendency to shift MPG read-out for unknown technical reasons?
     
    #1 wjtracy, Sep 18, 2012
  2. CaliforniaPrius

    CaliforniaPrius Active Member

    Joined:
    Oct 29, 2012
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    Location:
    Alameda, California
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    its calculation is based on some gas intake, not from actual consumption/lowered gas level in the tank
     
    #2 CaliforniaPrius, Oct 31, 2012
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