MPG changed after factory recall fixes

Discussion in 'Gen 4 Prius Fuel Economy' started by Jeremy K. Ashley, Jan 11, 2019.

  1. Jeremy K. Ashley

    Jeremy K. Ashley New Member

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    I have a 2017 Prius IV. I bought the car new in June of 2017. I took the car in for two factory recall fixes about 3 weeks ago. I usually get around 560 miles per tank +-. The last two fill ups I have gotten 440 and 486 miles per tank. My driving habits have not changed at all. Has anyone else had any recall fixes and or noticed a decline in the miles? I'm just at total loss as to why i'm having such a drastic change.
     
  2. alanclarkeau

    alanclarkeau Senior Member

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    What were the fixes? Do you keep a record of all your fills?
     
    #2 alanclarkeau, Jan 11, 2019
    Last edited: Jan 12, 2019
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  3. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Do you set tire pressures higher than Toyota spec ( per driver's door jamb sticker)? If so, they might have brought them back to spec: not a big factor, but some.
     
  4. Elektroingenieur

    Elektroingenieur Senior Member

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    If you’re referring only to safety recalls and service campaigns (as opposed to service bulletins), there have only been three for model year 2017 Prius cars sold in the U.S., and none of these does anything that would be expected to affect fuel economy: J0T is wrapping a wire harness with tape, J0R is reprogramming the intelligent clearance sonar, and 17R2 is setting the air pressure in the spare tire.

    Was any other work done at the same time? How is the work described on the repair order?

    Also, has your weather been colder lately? On my car, I’ve noticed that the engine runs more when heating is needed, even if the temperature is just a few degrees cooler than the air conditioning set point, so the fuel economy suffers a bit.
     
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  5. The Professor

    The Professor Active Member

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    Most likely tyre pressure changes or just the colder weather affecting fuel economy. I read somewhere that in the US the fuel blend also changes around this time which can reduce economy.
     
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  6. bisco

    bisco cookie crumbler

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    this complaint comes too frequently after factory service, no solution unfortunately
     
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  7. alanclarkeau

    alanclarkeau Senior Member

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    I've never seen it get worse - I've had improvements, particularly with my FORDs which they'd plug into the laptop each service, and it would re-map things sometimes when it loaded the latest software.

    I'm hoping he posts records of his last few fills - distance travelled with a tank is too vague to assess.
     
  8. Jtimc7

    Jtimc7 New Member

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    I drive a 2017 Prius that I’ve had for 13 months. I’ve only put 5100 miles on it. Back in October I took the car in for a recall check concerning the engine wire harness. They merely checked things and according to them did nothing to the vehicle. Immediately following this my mpg has dropped from the low-mid 60’s down to the low-mid 50’s?
    Tire pressure’s have remained constant.
    Any thoughts on this?
     
  9. The Professor

    The Professor Active Member

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    Most likely tyre pressure changes or just the colder weather affecting fuel economy. I read somewhere that in the US the fuel blend also changes around this time which can reduce economy.

    Deja vu?
     
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