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CPU updates @ 5,000 miles & 10,000 miles - Mileage chngd

Discussion in 'Gen 2 Prius Fuel Economy' started by Ken Cooper, Sep 4, 2004.

  1. Ken Cooper

    Ken Cooper New Member

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    During my 5,000 mile service visit the dealer did a CPU update. Following that. my mileage dropped from 49 mpg average to 47 mpg average.

    During my 10,000 mile service visit the dealer did another CPU update. Following that, my mileage increased from 47 mpg to 50 mpg.

    I can't see any factor other than the CPU update that might have affected mileage. In both cases, I checked the tire pressure following each visit. In both cases the tire pressure was factory spec.

    Anyone else experience this?
     
    #1 Ken Cooper, Sep 4, 2004
  2. hdrygas

    hdrygas New Member

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    Location:
    Olympia Wa
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    2004 Prius
    I would love to see the algorithms used to calculate "Tank average M.P.G.
     
    #2 hdrygas, Sep 4, 2004
  3. Bob Allen

    Bob Allen Captainbaba

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    I would too. I would also like to be smart enough to read them.
     
    #3 Bob Allen, Sep 9, 2004
  4. PearlDriver

    PearlDriver Junior Member

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    Location:
    Snohomish, WA
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    2007 Prius
    What kind of CPU "updates" were done and why?

    Many Prius owners, myself included, have stated that they notice a mileage change when the oil level is too high. The oil should be somewhere between full and low, not at or above full.
     
    #4 PearlDriver, Apr 16, 2010
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