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Root cause of poor gas mileage

Discussion in 'Gen 3 Prius Fuel Economy' started by mikeflores2000, Sep 3, 2017.

  1. Redwildwolf

    Redwildwolf New Member

    Joined:
    Sep 13, 2022
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    Location:
    Greensburg, PA 15601, USA
    Vehicle:
    2010 Prius
    Model:
    N/A
    I have a similar issue, no check light no codes but crappy mpg. Sparky boys looked dark tan so I changed them, got new coils still need to install them. Fresh air filter, tires are filled to 32psi.

    Something I have noticed is when the gas engine turned on the energy bar drops like a rock at the tiniest over the eco line... I am driving so gently that mother taresa looks like an abusive road racing granny.
     
  2. mikeflores2000

    mikeflores2000 Junior Member

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    May 9, 2014
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    Location:
    Merced, CA
    Vehicle:
    2010 Prius
    Model:
    IV
    I’m taking in my 2010 Toyota Prius for an oil change with 189000 miles September 16, 2022. Oil consumption due to loose oil filter leaking oil.
    MPG still around 29. Not changing oil more frequently at 5,000 miles instead of 10,000 miles recommended in owners manual likely wore out engine pistons and rings.
     
  3. Grit

    Grit Senior Member

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    Aug 22, 2017
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    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Same place that previously did the oil change?
     
    ASRDogman likes this.
  4. mikeflores2000

    mikeflores2000 Junior Member

    Joined:
    May 9, 2014
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    Location:
    Merced, CA
    Vehicle:
    2010 Prius
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    IV
    Steven’s Creek Toyota in San Jose, CA botched the oil change in 2017. Merced Toyota does stellar oil changes.
     
  5. a4rings

    a4rings Junior Member

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    Dec 25, 2016
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    Location:
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    Vehicle:
    2006 Prius
    Model:
    Two
    Would you say the sea foam was worth it?