Poor Mileage --- 2013 Prius

Discussion in 'Gen 3 Prius Fuel Economy' started by SlyCorona, Jan 7, 2023.

  1. SlyCorona

    SlyCorona Junior Member

    Joined:
    Aug 21, 2012
    4
    1
    0
    Vehicle:
    2003 Prius
    Model:
    N/A
    Hello to all,

    I have a 2013 Prius that consistently provides poor milage typically in the low to mid 30's under all driving conditions meaning city or highway driving and in either summer or winter driving. These are calculated numbers.

    The car has 150,000 miles, the check engine light is "off" and it is well maintained (oil changes, spark plugs, air filters, tires, etc.) and I use the same tires I used on my 2005 Prius which always provided milage in the mid to upper 40's.

    Any advice would be greatly appreciated.

    Regards

    Dave
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    101,126
    45,850
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    try a throttle body and maf cleaning. and clean the egrcircuit.

    see @NutzAboutBolts youtube diy videos
     
  3. SlyCorona

    SlyCorona Junior Member

    Joined:
    Aug 21, 2012
    4
    1
    0
    Vehicle:
    2003 Prius
    Model:
    N/A
    I did clean the MAF about a year ago with isopropyl alcohol. I will try a throttle body and maf cleaning. I never even thought modern cars had EGR circuits. I thought they were a thing of the past. I will look into
    it. Thank you for the advice!!!
     
    bisco likes this.
  4. Fast track

    Fast track Junior Member

    Joined:
    Dec 8, 2015
    12
    1
    0
    Location:
    Mesquite NV
    Vehicle:
    2015 Prius
    Model:
    Four
    I have a 2015 Prius with only 41,500 miles. I can’t seem to get over 37 to 39 mpg combined City and highway. Tires replaced around 10,000 miles ago, we installed required rolling resistance tires (psi 35 front, 33 rear) Oil and filter changed regularly (3,000 to 5,000 miles). Engine air filter changed yearly. Any recommendations on how I can get it better?
     
    #4 Fast track, Jan 23, 2023
    Last edited: Jan 23, 2023
  5. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    4,676
    2,648
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    What brand of tire? Their info may say RRtires, but not for a Prius.
    That's what the info for my tires said. I gained about 4 mpg in the city.
    But lost about 6mpg on the highway. 90+% of my driving is highway.
    I dropped from 48 to 42mpg. HUGE for me. These might just get nail on the outer/inner
    tread so they'll have to replace them with better tires. :whistle:
    It pays to get road hazzard insurance.

     
  6. Fast track

    Fast track Junior Member

    Joined:
    Dec 8, 2015
    12
    1
    0
    Location:
    Mesquite NV
    Vehicle:
    2015 Prius
    Model:
    Four
    Michelin tires purchased at local Toyota dealer. We owned a 2010 prius prior to this that got much better mileage.
     
  7. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    49,951
    35,533
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    What specific Michelin tire?
     
  8. Fast track

    Fast track Junior Member

    Joined:
    Dec 8, 2015
    12
    1
    0
    Location:
    Mesquite NV
    Vehicle:
    2015 Prius
    Model:
    Four
    Michelin Premier A/S 195/65R15
     
  9. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

    Joined:
    Oct 17, 2010
    49,951
    35,533
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    There have been reports here about those, they dropped mpg significantly. I think the sidewall says "Total Performance" instead of "Green X".

    I really have little faith in either of those labels btw. I replaced our OEM Michelin PIlot hx MXM4 (with "Green X" badge), with Michelin Primacy MXM4 (also with "Green X" badge") and our mpg dropped significantly . Very gradually has climbed back up, still not back to pre-swap level though.

    My take, you've got to take each tire as an unknown quantity; the manfucturer's claims have little merit.
     
  10. nicoj36

    nicoj36 Active Member

    Joined:
    Oct 15, 2013
    365
    104
    0
    Vehicle:
    2010 Prius
    Model:
    II


    Try this takes only 3 minutes. I’ve gained back 5-6 mpg simply by performing this reset. Also fuel system cleaners.
     
Loading...