1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Odometer Glitch - reading high mpg

Discussion in 'Gen 4 Prius Main Forum' started by JObe, Nov 23, 2021.

  1. JObe

    JObe Junior Member

    Joined:
    Dec 16, 2019
    17
    7
    0
    Location:
    Ventura, CA
    Vehicle:
    2016 Prius
    Model:
    Two
    2016 Gen4 Prius main odometer mpg jumped up about 4mpg in the last week. 75k miles on car, been tracking around 54mpg, suddenly car is lifetime 58mpg and it ebbs and flows with every trip +/- half gallon mpg. All the other mpg readouts look correct, for example Trip B (used for oil changes) reads steady at 54.2mpg @ 7559 miles.

    Any ideas why the big mpg monitor would suddenly be fluctuating? No change in driving style, commute, etc.
     
    #1 JObe, Nov 23, 2021
  2. JObe

    JObe Junior Member

    Joined:
    Dec 16, 2019
    17
    7
    0
    Location:
    Ventura, CA
    Vehicle:
    2016 Prius
    Model:
    Two
    After digging I found the threads that cover this topic- searched for MPG. Seems the idea is it resets when History is reset. Pretty sure I haven’t done that and wife says same. Also today I had a weird thing where touchscreen was frozen, corrected only after turning off/on. And my AC seems weak. No work done, no change in driving habits. Gremlins? Menehune?
     
    #2 JObe, Nov 24, 2021
  3. 2010moneypit?

    2010moneypit? Active Member

    Joined:
    Oct 26, 2021
    314
    122
    0
    Location:
    Beaumont ca
    Vehicle:
    2010 Prius
    Model:
    V
    Check the good old 12 volt battery. It can cause all kinds of problems including your infotainment system having problems booting up. If it’s more than four years old I would just replace it.
     
    #3 2010moneypit?, Nov 25, 2021
    kc5dlo and JObe like this.
  4. sclevine

    sclevine Active Member

    Joined:
    Dec 23, 2016
    119
    136
    2
    Location:
    New York, NY
    Vehicle:
    2024 Prius
    Model:
    XLE
    I noticed something similar with mine and suspected that it is not a full history MPG but a rolling history going back some number of miles or days, etc - which would be weird I admit. But it can be reset just like A/B.
     
    #4 sclevine, Nov 25, 2021
  5. wyobob

    wyobob New Member

    Joined:
    Nov 26, 2021
    8
    2
    0
    Location:
    Oregon
    Vehicle:
    2022 Prius Prime
    Model:
    XLE
    Did you accidentally reset the main odometer, which didn't reset miles, but did reset mpg, as mentioned in prior reply?
     
    #5 wyobob, Nov 26, 2021
  6. JObe

    JObe Junior Member

    Joined:
    Dec 16, 2019
    17
    7
    0
    Location:
    Ventura, CA
    Vehicle:
    2016 Prius
    Model:
    Two
    I’ve considered this, but don’t think so. Not positive.
     
    #6 JObe, Nov 26, 2021
  7. JObe

    JObe Junior Member

    Joined:
    Dec 16, 2019
    17
    7
    0
    Location:
    Ventura, CA
    Vehicle:
    2016 Prius
    Model:
    Two
    Bummer is this is the case. As others discussed in diff threads - Toyota should lock the main mpg. What’s the point of having this one (attached to lifetime odometer) if it’s variable?
     
    #7 JObe, Nov 26, 2021
  8. tucatz

    tucatz Active Member

    Joined:
    Jul 11, 2010
    501
    416
    0
    Location:
    Manzanita, Oregon
    Vehicle:
    2016 Prius
    Model:
    Four Touring
    The computer has multiple mileage calculators: current trip, trip a, trip b, lifetime. This knowledge is extremely useful. Just press the button on your steering wheel to toggle between the displays.
     
    #8 tucatz, Nov 27, 2021
(You must log in or sign up to post here.)