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Decrease in MPG

Discussion in 'Prime Fuel Economy & EV Range' started by Hoan, Dec 9, 2021.

  1. Hoan

    Hoan Junior Member

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    Hi everyone,
    My 2020 Prime XLE is getting around 45 MPG. 30k miles so far, new tire good tire pressure, oil change every 5000 miles. I'm not using AC or heat. Yet my milage is around 45 MPG. Does anyone have idea why my MPG dropped?
     
    #1 Hoan, Dec 9, 2021
  2. schja01

    schja01 One of very few in Chicagoland

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    Winter fuel blend?
     
    #2 schja01, Dec 9, 2021
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  3. bisco

    bisco cookie crumbler

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    new tires, are they LRR?

    what has your previous mopg been like? how are you measuring it?
     
    #3 bisco, Dec 9, 2021
  4. Hoan

    Hoan Junior Member

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    No, it stated this last summer. I drive like a granny too.
     
    #4 Hoan, Dec 9, 2021
  5. dig4dirt

    dig4dirt MoonGlow

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    Have you checked air filter?

    Do you have any pets that ride in car? There is also HV Battery filters that should be checked too.

    Brakes or eBrake checked out?
     
    #5 dig4dirt, Dec 9, 2021
  6. Hoan

    Hoan Junior Member

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    The new tires are low rolling resitence.
     
    #6 Hoan, Dec 9, 2021
  7. Hoan

    Hoan Junior Member

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    I take care of my car well. New engine air filter, new cabin air fliter. I clean my traction battery air filter once a month. No pets in the car, I use Seafoam every oil change to clean the fuel injectors. And to ounces to clean the engine before my oil change as well. Even cleaned my intake mainifold, EGR, and throttle body at 25k miles. Before on the dash I was getting 55ish to 62 MPG on hybrid mode. Also my total range went from 525 miles on a full tank to 420 miles range on a full tank when I fill up.
     
    #7 Hoan, Dec 9, 2021
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  8. bisco

    bisco cookie crumbler

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    definitely winter blend and new tires then. might be worth checking for brake drag
     
    #8 bisco, Dec 9, 2021
  9. Salamander_King

    Salamander_King Senior Member

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    Does it get cold in LA? My HV-only mpg for the same route dropped from 65mpg ~1month ago to ~50mpg just a few days ago when the temp dropped to teens F. I was getting ~35 miles of EV range from a full charge, but now, I am lucky if I can get 20 miles in my morning commute.
     
    #9 Salamander_King, Dec 9, 2021
  10. Hoan

    Hoan Junior Member

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    It's not that cold here in Los Angeles. I also clean the MAF sensor with each oil change as well.
     
    #10 Hoan, Dec 9, 2021
  11. bisco

    bisco cookie crumbler

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    that's a lot of unnecessary maintenance. perhaps you've overdone something
     
    #11 bisco, Dec 9, 2021
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  12. BiomedO1

    BiomedO1 Senior Member

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    I guess you haven't heard the old adage; "If it ain't broke, don't mess with it". How did you clean the MAF sensor?
    You really shouldn't be exposing practically new sensors to those harsh chemical strippers. Those cleaning products you mentioned are designed to strip away carbon, varnish, and oil. Using 0w20 or 0w16 full synthetic oil with advanced detergents - accumulated buildup is minimal at best; especially if you've been keeping up with the OEM maintenance requirements. Your more likely to damage or shorten the life of those sensors. That's just my 2-cents; take it or leave it.

    Your mileage drop is more than likely weather and winter gas blend related; unless you threw off one of your sensors. The sensor may still be within range, otherwise it'll throw a code. Check all four wheels, you may have mechanical drag due to a frozen caliper slider pin.
     
    #12 BiomedO1, Dec 9, 2021
    Last edited: Dec 9, 2021
    MTN and Salamander_King like this.
  13. MikeDee

    MikeDee Senior Member

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    I thought winter blend gave you more mpg?


    iPhone ? Pro
     
    #13 MikeDee, Dec 25, 2021
  14. bisco

    bisco cookie crumbler

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    nope
     
    #14 bisco, Dec 25, 2021
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  15. bisco

    bisco cookie crumbler

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    #15 bisco, Dec 25, 2021
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