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

battle between the gauges... whos right? who will WIN?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Beachbummm, Aug 6, 2017.

Tags:
  1. Beachbummm

    Beachbummm Senior Member

    Joined:
    Sep 12, 2013
    1,160
    392
    0
    Location:
    Florida
    Vehicle:
    2008 Prius
    Model:
    Five
    so I filled up yesterday until the pump clicked, I don't like to over fill..
    round trip 156 miles..
    MFD reporting 50.6 MPG
    dash gauge one block below half a tank
    refill same station, same pump, same click..

    6.7 gallons?
    23.4 mpg?
    Wth?
    I just did an oil change, new plugs, cleaned the map sensor and new pcv valve

    I reset the gas gauge as per the instructions on line..
    if its getting 23 mpg I have the worst prius ever built.
     
    #1 Beachbummm, Aug 6, 2017
  2. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    11,518
    14,124
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius
    Model:
    Two
    Did you disconnect the 12V battery at some point? If I remember right, that clears your trip meter and you could have had more miles than it read. I always go by the odometer reading, not the trip meter.
     
    #2 jerrymildred, Aug 6, 2017
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    109,375
    49,715
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i don't think the car filled up the first time. what do you mean, 'reset the gas gauge'?
     
    #3 bisco, Aug 6, 2017
    jerrymildred likes this.
  4. Beachbummm

    Beachbummm Senior Member

    Joined:
    Sep 12, 2013
    1,160
    392
    0
    Location:
    Florida
    Vehicle:
    2008 Prius
    Model:
    Five
    the dealer disconnected it when they did the abs pump replacement but I always zero the miles when I
    it should have clicked off at about the same amount of gas in the tank both time, gauge read full both times.. Ill see after this tank
     
    #4 Beachbummm, Aug 6, 2017
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    109,375
    49,715
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you have a bladder. not always the same, but you will find out.
     
    #5 bisco, Aug 6, 2017
    jerrymildred likes this.
  6. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,436
    10,258
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    It's a Gen2, with a bladder, so major tank-to-tank refill level differences are common. Watch a longer term, multi-tank average instead.

    Does your fuel log include the main odometer reading, so that you can ferret out errors or blunders or unnoticed resets in the trip odometer?
     
    #6 fuzzy1, Aug 6, 2017
    jerrymildred likes this.
  7. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    11,518
    14,124
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius
    Model:
    Two
    The bladder does cause some crazy errors, but I never had one that bad. I still think it was the pump handle, maybe combined with a less than full fill-up the time before.

    My general rule of thumb is that the trip meter provides nice entertainment along with the computer's mpg guestimate, but the actual facts come through using pump gallons with odometer readings over multiple tanks. If any one tank mpg is accurate, it would be the luck of the draw and you'd have no way of knowing if it's right or not.
     
    #7 jerrymildred, Aug 7, 2017
(You must log in or sign up to post here.)