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Odometer MPG jumped from 117 to 199

Discussion in 'Prime Main Forum (2017-2022)' started by randerson9248, Feb 4, 2023.

  1. randerson9248

    randerson9248 Junior Member

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    My odometer just went to over 80,000 miles this week. But, the MPG sometime this week went from 117.0 to 199.9. Trip A and Trip B MPG numbers are still correct. Anyone else have this happen?
     
  2. Salamander_King

    Salamander_King Senior Member

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    You must have reset the fuel efficiency data associated with the odometer. The 199.9mpg was the max value for a 2017 PP model. If yours is a 2017 PP, it means after the reset, you have driven only (or almost all) in the EV mode (no or very little gas).

    You can have this number for a very short period. As soon as you drive any distance on HV mode using a gas engine, it will come down.
     
    #2 Salamander_King, Feb 4, 2023
    Last edited: Feb 4, 2023
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  3. BiomedO1

    BiomedO1 Senior Member

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    You may also have a low 12vdc battery, causing gremlins.

    Just a thought.....
     
  4. jerrymildred

    jerrymildred Senior Member

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    Disconnecting the 12V will have no effect on the MPG numbers. But if you have the main odometer on display and hold the "Trip" button too long, it'll reset the MPG lifetime stats. I did this twice by accident.
     
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  5. randerson9248

    randerson9248 Junior Member

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    2017 Prius Prime
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    Prime Advanced
    Thanks jerry, I think that must be what happened. I took a longer trip and used gas for awhile, now the mpg shows about 155.
     
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