Mileage drop on 2006 after 12 volt battery install

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Robert Schlitz, Aug 18, 2021.

  1. Robert Schlitz

    Robert Schlitz New Member

    Joined:
    Aug 18, 2021
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    Location:
    PA
    Vehicle:
    2006 Prius
    Model:
    ----USA----
    I own a full loaded 2006 Prius purchased used one owner in 2013 at 80K , current mileage 165k. I had a new 12 volt battery installed at Toyota dealer April 2021 this was the second 12 volt replacement first one was about 6 years ago . I had been getting a steady average of 44mpg when , since the battery change it dropped to 36-37mpg - recent road trip in 95 degree heat brought it up to 37.6 the highest I have had since April . I assume my hybrid battery is showing signs of failure, the car is 15 years old . Is there any correlation with the 12 volt job ? Or just coincidence. I don’t want to start shopping for a new car, just got new brakes tires and battery it’s good to go and used Prius prices are inflated right now .
     
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  2. TheLastMojojomo

    Joined:
    Sep 14, 2016
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    Location:
    US
    Vehicle:
    2009 Prius
    Model:
    Touring
    I have had the same experience in my Prius after a 12v replacement.

    See my Post below that describes what happened to me: Hybrid System Less Efficient After 12V Disconnect/Battery Change? ECU's?




    Posted via the PriusChat mobile app.
     
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