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strange MPG loss

Discussion in 'Gen 2 Prius Fuel Economy' started by dwp-wa, May 29, 2009.

  1. dwp-wa

    dwp-wa New Member

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    Auburn, WA
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    2005 Prius
    My oil/filter changes never work out the same as other services. Just before 15,000 miles, the MPG went down to 28 MPG, and back up after service. I have the 30,000 miles service next Monday. After I had the oil changed last month, my MPG dropped from 44 MPG to 32 MPG. The dealer swears they do not cause this, but it sure looks suspicious.
     
    #1 dwp-wa, May 29, 2009
  2. ceric

    ceric New Member

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    Some people are more careful. They disconnect the (-) terminal of battery to avoid getting shocked or shorting the circuitry. It is probably a good practice. However, that would probably send the computer setting back to factory setting. Whatever, the car has learned from you or you have trained it is gone.
    Disconnecting the (-) is a command way to get settings back to factory. Same goes for changing the battery unless you use a parallel battery when replacing it.
     
    #2 ceric, May 29, 2009
  3. richard schumacher

    richard schumacher shortbus driver

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    Do you check the oil level yourself immediately after the service, before leaving the dealer? A severe overfill can reduce MPGs (and everyone should always check anyway, to find gross errors).

    How often do you check tire pressures?
     
    #3 richard schumacher, May 29, 2009
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