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Mysterious Drop in Gas Mileage

Discussion in 'Prius v Fuel Economy' started by zzzzhu456, Apr 24, 2019.

  1. zzzzhu456

    zzzzhu456 New Member

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    Location:
    new york
    Vehicle:
    2012 Prius v wagon
    Model:
    ----USA----
    For the last two months there’s been a significant drop in my 2012 v’s gas mileage that I can’t explain. Since the weather warmed up at the end of June and for several thousand miles I’ve been averaging 46-48 mpg per tank in highway driving over the same route. I use eco mode and try to drive at speeds between 60-65 mph, modulating the peddle pressure to keep the HSI from exceeding two bars past the center mark.
     
    #1 zzzzhu456, Apr 24, 2019
  2. Air_Boss

    Air_Boss Senior Member

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    Location:
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    Vehicle:
    2012 Prius v wagon
    Model:
    Five

    Any service or TSB work done on or to the car? Tire pressures, air filter and 12V battery condition checked?
     
    #2 Air_Boss, Apr 25, 2019
  3. bisco

    bisco cookie crumbler

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    Plug-in Base
    what has it dropped to?
     
    #3 bisco, Apr 25, 2019
  4. Tim Jones

    Tim Jones Senior Member

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    Could be a weak traction battery..................
     
    #4 Tim Jones, Jul 29, 2019
  5. Ronald Doles

    Ronald Doles Active Member

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    Location:
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    Vehicle:
    2015 Prius v wagon
    Model:
    Two
    What were the temperature changes? Our mileage drops when we have to run the air conditioning more.
     
    #5 Ronald Doles, Jul 30, 2019
  6. jerrymildred

    jerrymildred Senior Member

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    Two
    I don't think he wants to talk to us anymore. :cry:
     
    #6 jerrymildred, Jul 30, 2019
    Raytheeagle likes this.
  7. Raytheeagle

    Raytheeagle Senior Member

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    Vehicle:
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    Model:
    Prime Plus
    Might be napping based on their name:whistle:.
     
    #7 Raytheeagle, Jul 30, 2019
    jerrymildred likes this.
  8. Mechanics Daughter

    Mechanics Daughter Junior Member

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    Location:
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    Vehicle:
    2004 Prius
    Model:
    ----USA----
    My 2017 Prius Prime has the A/c stuck ON.
    It won’t turn off when I push ‘off’ in the A/c screen.
    My driving scores have dropped from the 80’s+ range to 50’s. Then screen asks if I can charge traction batter with a/c on.
    Is it broken?
     
    #8 Mechanics Daughter, Aug 26, 2019
  9. bisco

    bisco cookie crumbler

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    2012 Prius Plug-in
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    Plug-in Base
    sounds like it. try pressing the auto button
     
    #9 bisco, Aug 26, 2019
  10. jerrymildred

    jerrymildred Senior Member

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    Two
    Is it still under warranty?
     
    #10 jerrymildred, Aug 27, 2019
  11. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    On this site, there are separate sections for the various models and model years and the one you posted in is the v wagon section. You may get better answers if you ask this question in the Prime area of the forums. Not all Prius models are the same.
     
    #11 mikefocke, Aug 27, 2019
    jerrymildred likes this.
  12. Prius4Life!

    Prius4Life! New Member

    Joined:
    Sep 10, 2019
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    Location:
    Dallas, TX
    Vehicle:
    2012 Prius v wagon
    Model:
    Four Touring
    I have been experiencing the same issue for the last month or so in my 2012 Prius V. I just turned it in for a diagnostic at Pep Boys this last weekend after I started getting an intermittent misfire in the engine (codes P0300 & P0301). It turns out that I have water in two of the engine cylinders.

    My guess would be that a drop in mileage could very well be indicative of the beginnings of the need for an engine rebuild.

    Hope this helps!
     
    #12 Prius4Life!, Sep 10, 2019
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