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Dashboard mpg inaccuracies

Discussion in 'Gen 3 Prius Fuel Economy' started by Mola, Apr 5, 2018.

  1. Mola

    Mola Junior Member

    Joined:
    Feb 2, 2018
    41
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    0
    Location:
    West Mi
    Vehicle:
    2010 Prius
    Model:
    IV
    It is always off by 2 to 2.5 mpg every fill-up.

    Same pump, same procedure when filling.

    Pump to full to auto shut off, 10 sec then pump to auto shut off, 10 sec then auto shut off then done .
     
    #1 Mola, Apr 5, 2018
  2. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,323
    10,170
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Normal. We even have old threads comparing our individual inaccuracies, which vary by car / driver / conditions.

    Unlike speedometers and odometers, there are no legal or industry standards for this 'lie-o-meter'.
     
    #2 fuzzy1, Apr 5, 2018
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    108,912
    49,492
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    welcome to the weird wacky world of prius.:cool:
     
    #3 bisco, Apr 5, 2018
  4. marlinsmobile

    marlinsmobile Active Member

    Joined:
    Dec 3, 2015
    106
    131
    6
    Location:
    Sandy Springs (Atlanta), GA
    Vehicle:
    2013 Prius
    Model:
    Two
    Sounds about right (my average over two years has been +3 mpg, or about 6% optimistic on the dashboard). I mentally subtract 3 mpg from the consumption number on the HSI.
    My detail: Tableau Public
     
    #4 marlinsmobile, Apr 5, 2018
  5. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    6,148
    4,057
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Here's a monkey wrench you can try to catch, techstream has my speed 1 to 3 mph slower than dashboard display constantly, running on 15" tires.
     
    #5 Grit, Apr 5, 2018
  6. Higgins909

    Higgins909 Member

    Joined:
    Apr 15, 2018
    257
    58
    2
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    III
    Mines usually 2-3mpg higher then actual. I also have 2~ gallons of gas left when the beeper goes off. My speedometer is 1-2mph higher then gps. (gps has been checked over time with different vehicles)
     
    #6 Higgins909, Apr 15, 2018
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