Finally calling it quits

Discussion in 'Gen 2 Prius Main Forum' started by danboy, Nov 13, 2025.

  1. jarrad reddick

    jarrad reddick Junior Member

    Joined:
    Jan 6, 2018
    9
    2
    0
    Location:
    atlanta
    Vehicle:
    2005 Prius
    Model:
    N/A
    Disregard my above comment; sent in error. But just checking to see if the car was given away yet. I would love to add it to the collection (if nephew is too good for your old beater)
     
  2. rjparker

    rjparker Tu Humilde Sirviente

    Joined:
    Jun 6, 2008
    10,608
    6,653
    7
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Up to a certain year, gen2s would stop counting at 299k. Past that year they kept accumulating.

    See post 5. There are benefits to reading the thread.
     
  3. pasadena_commut

    pasadena_commut Senior Member

    Joined:
    May 2, 2019
    2,904
    877
    0
    Location:
    Southern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    That limit always struck me as a particularly bizarre engineering choice.

    I'm not privy to the design of the display, but it would surprise me if the high digit isn't physically capable of lighting up (if wired to do so) to show all 10 digits. They may have used a custom "only 1 and 2" display element, but since the market generally demands all 10 digits be possible (often with plus, minus, period, and/or comma) that reduced function element would cost more than a full function element.

    Also there's nothing special about 299k (actually 300000 - 1). It isn't a power of 2 thing. 2^18 is 262144, so they need at least 19 bits to do 299k, and 2^19 is 524288. If they could count that high, why not stop there? But these days any sort of adder is going to come in multiples of 8 bits, and the next one up is 2^24, which would have got them all the way to 16777216. Could they have been using binary coded decimal rather than binary? Sure, but then they would have needed a whole digit for the high value, and that would have put the limit at 999k. Once again, I suppose they could have crippled the top digit by giving it only two bits, but you see the problem. One bit would not have been able to count to 2 in that position, because the count starts at 0, but 2 would allow it to count 3, and the limit would have been 399k.