1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Decrease in MPG

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

  1. Hoan

    Hoan Junior Member

    Joined:
    Nov 16, 2021
    19
    7
    0
    Location:
    Los Angeles
    Vehicle:
    2020 Prius Prime
    Model:
    XLE
    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

    Joined:
    Apr 22, 2005
    1,765
    1,169
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    Winter fuel blend?
     
    #2 schja01, Dec 9, 2021
    bisco likes this.
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    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

    Joined:
    Nov 16, 2021
    19
    7
    0
    Location:
    Los Angeles
    Vehicle:
    2020 Prius Prime
    Model:
    XLE
    No, it stated this last summer. I drive like a granny too.
     
    #4 Hoan, Dec 9, 2021
  5. dig4dirt

    dig4dirt MoonGlow

    Joined:
    Apr 6, 2012
    1,150
    741
    0
    Location:
    Lancaster Co PA
    Vehicle:
    2014 Prius c
    Model:
    Two
    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

    Joined:
    Nov 16, 2021
    19
    7
    0
    Location:
    Los Angeles
    Vehicle:
    2020 Prius Prime
    Model:
    XLE
    The new tires are low rolling resitence.
     
    #6 Hoan, Dec 9, 2021
  7. Hoan

    Hoan Junior Member

    Joined:
    Nov 16, 2021
    19
    7
    0
    Location:
    Los Angeles
    Vehicle:
    2020 Prius Prime
    Model:
    XLE
    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
    bisco likes this.
  8. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    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

    Joined:
    Nov 8, 2015
    10,985
    8,886
    0
    Location:
    New England
    Vehicle:
    Other Hybrid
    Model:
    N/A
    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

    Joined:
    Nov 16, 2021
    19
    7
    0
    Location:
    Los Angeles
    Vehicle:
    2020 Prius Prime
    Model:
    XLE
    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

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    that's a lot of unnecessary maintenance. perhaps you've overdone something
     
    #11 bisco, Dec 9, 2021
    MTN likes this.
  12. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    1,831
    928
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    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

    Joined:
    May 9, 2013
    1,561
    594
    0
    Location:
    San Francisco Bay Area
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    I thought winter blend gave you more mpg?


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

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    nope
     
    #14 bisco, Dec 25, 2021
    MTN likes this.
  15. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    #15 bisco, Dec 25, 2021
(You must log in or sign up to post here.)