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Consumption Average not updating

Discussion in 'Gen 2 Prius Technical Discussion' started by BillHahn, Sep 11, 2006.

  1. BillHahn

    BillHahn New Member

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    Hi all,

    This is a minor problem, but I'm wondering if anyone else has seen it, or if I caused it to happend in advertantly.

    The average mpg displayed on the consumption screen stayed at 58.5 for four days - never varied, and I *know*
    it should have. (It did in the past, and my commute is downhill one way and uphill the other.) This continued even
    after refueling. Finally, I hit the "reset" after refueling and the problem went away - the average updated and varied
    quite a bit as usual. (In fact, I briefly saw 62.5 for a second, but that's another story.)

    The only thing I've done that might have possibly caused this was starting up the car and starting to move before
    realizing that I hadn't released the parking brake. This happened twice, in each case I realized what was happening
    before moving 10 feet....

    Anybody else see the average on the consumption screen "stick" at a number?

    Thanks in advance,
    Bill H.
     
    #1 BillHahn, Sep 11, 2006
  2. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(BillHahn @ Sep 11 2006, 09:40 AM) [snapback]317682[/snapback]</div>
    The '06 does not reset itself after fill-up.
    After you reset you'll see dramatic swings in the reported MPG b/c there are so few miles...you might have a few mile at 70+mpg, then get in stop & go traffic for a 1/2 mile and see the average drop to the 30s, then creap back up to the 60s by the time you get to your destination.

    But once you have 400-500 miles on a tank the alterations of the tank mileage are much smaller and much less frequent....400 miles at 58.5mpg then 1 mile at 30mpg will not affect the overall mileage on the display at all. I suspect this is the phenomenon you were witnessing....futher, if you hadn't reset the mpg over the previous fill-ups you could easily have had a couple thousand miles averaging to your 58.5mpg...it would take a very long segment of lower mpg to cause that to swing at all.

    The parking brake has nothing to do with it.
     
    #2 efusco, Sep 11, 2006
  3. BillHahn

    BillHahn New Member

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    Evan,

    Thanks for your reply - I'll break out the owner's manual now and start reading....too late,
    I know. I assumed it auto-reset after fill-up....does it auto-reset only the "miles on current tank"
    and leave the average alone....I know, time to read the manual..

    By the way, thanks for earlier posts of yours which helped me tremendously!

    Cheers,
    Bill Hahn

    <div class='quotetop'>QUOTE(efusco @ Sep 11 2006, 10:55 AM) [snapback]317698[/snapback]</div>
     
    #3 BillHahn, Sep 11, 2006
  4. efusco

    efusco Moderator Emeritus
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    <div class='quotetop'>QUOTE(BillHahn @ Sep 11 2006, 10:20 AM) [snapback]317708[/snapback]</div>
    On the '06, yes, that's exactly what it does....so basicly it's a rolling lifetime average. Handy if you want to see an average MPG for a whole trip or just for the lifetime of the car (assuming noone accidently touches the reset).

    The '04 & '05 reset both miles and mpg each fill up.
     
    #4 efusco, Sep 11, 2006
  5. eagle33199

    eagle33199 Platinum Member

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    The manual wouldn't help here... it says they both reset (as they do for older models), however only the miles reset, not the average
     
    #5 eagle33199, Sep 11, 2006
  6. BillHahn

    BillHahn New Member

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    Thanks all - I guess after 3+ months of ownership I was settling in on 58.5 as a "lifetime" average.
    (My commute is ideal for getting good mileage.)

    Early on I drove 1200 miles (long round trip) and averaged about 53, but since then my commute probably
    brought the average back up to 58.5, which means I probably have done even better on the commute.

    It's funny, I'm still looking at the same numbers and facts as before, but now I feel much better whereas before I
    was just bewildered....shows what one faulty assumption can do....thanks again for the answers...

    --Bill H.
     
    #6 BillHahn, Sep 11, 2006
  7. Claudia

    Claudia New Member

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    How do you find the average? All I've seen is the trip average, which resets when I tell it to. Is there something that's accurate that doesn't reset that I can check?
     
    #7 Claudia, Sep 11, 2006
  8. BillHahn

    BillHahn New Member

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    Claudia,

    I just found this thread

    http://priuschat.com/index.php?showtopic=23943

    which may explain what happens wrt to resetting of the average.

    <div class='quotetop'>QUOTE(Claudia @ Sep 11 2006, 01:21 PM) [snapback]317800[/snapback]</div>
     
    #8 BillHahn, Sep 11, 2006
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