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Weird behavior at Refuel

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by cnc97, Sep 13, 2019.

  1. cnc97

    cnc97 Senior Member

    Joined:
    Mar 13, 2018
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    Location:
    Evansville, IN
    Vehicle:
    2010 Prius
    Model:
    Three
    Has anyone else noticed that at refuel, the indicated CONS number on the dash is substantially lower for the first 15-20 miles? I’m now 40 miles into this tank, and the mileage stabilized at 49.3 mpg. It was crazy low in the high 20’s for a while and gradually climbed to where it’s at now. I haven’t been doing any drastic changes to my driving habits, so I think that’s out. I can and have reset the trip meter at varying miles after fueling up and it never dropped that far. Only to around 44-47. I know it’s been crazy hot this past week(mid to upper 90’s)and it could be just coincidence that I see the drop off at filling up. I hope it’s not another issue rearing it’s head. All three battery temps are running within a few degrees of the air inlet temp, and the battery fan is on, just not the top speed.
     
    #1 cnc97, Sep 13, 2019
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    just off the top of my head, i feel like the mpg's always start higher after a fill up, then gradually come down.
     
    #2 bisco, Sep 13, 2019
    Data Daedalus likes this.
  3. Data Daedalus

    Data Daedalus Senior Member

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    Jul 6, 2013
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    Location:
    Wembley, London
    Vehicle:
    2008 Prius
    Model:
    II
    Aye! Filled up yesterday, and halfway home as I was cruising uphill, checked my MPGs on the MFD.
    It was 79.4mpg. By the time I got home, it was 65.4mpg. That was a barely 1 mile journey.
    Yes, the engine was already optimally hot when I filled up.

    Last fill up stats were 559 miles @ 61.0mpg - got 43 litres into the tank. Was on annual leave for 2 weeks so lots of shorter journeys with AC at full tilt, ferrying my daughter around on demand


    iPhone 6s +
     
    #3 Data Daedalus, Sep 15, 2019
    bisco likes this.
  4. CR94

    CR94 Senior Member

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    Dec 2, 2014
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    Location:
    Northwestern S.C.
    Vehicle:
    2011 Prius
    Model:
    Two
    Mine seems to behave logically according to basic arithmetic, which isn't weird at all.
     
    #4 CR94, Sep 15, 2019
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