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

Gen 3 with bad MPG

Discussion in 'Gen 3 Prius Fuel Economy' started by Delusional Mind, Jan 12, 2020.

  1. Delusional Mind

    Delusional Mind New Member

    Joined:
    Jan 12, 2020
    4
    0
    0
    Location:
    Springfield, MO
    Vehicle:
    2011 Prius
    Model:
    III
    So seems everyone is saying that it would not be unusual for me to get crappy gas milage in my 2011 prius with 210,000 miles and the original 12v battery. Mine also suffers the disappearing oil syndrom common in the 2011 gen 3. Any thoughts on that?
     
    #1 Delusional Mind, Jan 12, 2020
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,693
    48,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    clogged egr?
     
    #2 bisco, Jan 12, 2020
    Delusional Mind likes this.
  3. Delusional Mind

    Delusional Mind New Member

    Joined:
    Jan 12, 2020
    4
    0
    0
    Location:
    Springfield, MO
    Vehicle:
    2011 Prius
    Model:
    III
    I'm on it as soon as my garage warms up. Thx.
     
    #3 Delusional Mind, Jan 17, 2020
  4. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    6,111
    4,038
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    According to the post title/subject, and no information in the thread about estimate MPGs per tank, I would say not enough information provided. Personally, whenever my previous tank averages 60 mpgs or lower, I lose sleep and that constitute as bad MPG. Since you didn't define what bad mpg is, let's go by my standard; youre right under 60 mpgs mark also :ROFLMAO:
     
    #4 Grit, Jan 17, 2020
  5. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,662
    38,207
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    1. Replace the 12 volt battery. Don't bother testing, go straight to replacement.
    2. Track the mpg for a few tanks and report.
    3. Monitor the oil loss for a while and report.
    4. EGR and intake manifold cleaning is waaay overdue: clean both asap. You're in head gasket failure now.
    5. Look into oil catch can.
     
    #5 Mendel Leisk, Jan 17, 2020
    bunny45 likes this.
  6. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    6,111
    4,038
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    I would tackle the easy things first; tire psi, tire make & model + see post #5 first item on list.
     
    #6 Grit, Jan 17, 2020
(You must log in or sign up to post here.)