Declining MPG (With charts)

Discussion in 'Gen 2 Prius Fuel Economy' started by jsinclair92, Feb 25, 2019.

  1. gptoyz

    gptoyz Junior Member

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    how about the tires and alignment?
    Are you running low rolling resistance tires?
    Tire Pressures inflated? If my tire max psi is 51 psi (I usually run 42-44)
    Alignment? too much toe can create extra rolling resistance
    Cleaning out the oil pooling in the intake manifold
    Tranmission fluid flush?
    Also, by now I'm sure catalytic converter is probably very much clogged or getting there
     
  2. PAUL SCHULTZ

    PAUL SCHULTZ Member

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    You have received a lot of great suggestions and advice but I am not convinced by your data that you have a problem. There is too much variability in seasonal MPG to rely on a regression line that has a slight decline as it encompasses the known decrease in MPG during the cold weather months. My visual inspection of your graph it looks to me as if the winter 2017-2108 data looks similar to the winter 2018-2019 data. I use fuelly to record my data and have a similar seasonal fluctuation.

    Paul
     
    srellim234, audiodave and Robert Holt like this.
  3. Lord Byron

    Lord Byron Member

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    60AE4A44-63AD-4DDB-9682-CBF763865B2E.jpeg Have you cleaned the battery pack fan? If not, give that a go. It is one of the forgotten maintenance projects and it definitely helps.
     
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