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

2012 Prius MPG gauge

Discussion in 'Gen 3 Prius Fuel Economy' started by alfon, Feb 17, 2012.

  1. alfon

    alfon Senior Member

    Joined:
    May 17, 2009
    1,370
    270
    0
    Location:
    seaside, oregon
    Vehicle:
    2010 Prius
    Model:
    III
    If you have a 2012 model year Prius let us know
    if the MPG gauge is accurate or if its over reading like the
    2010, and 2011 model years are by about 3 - 3.5 mpg.

    I have read that the 2012 Prius C model the gauge when tested
    by Wayne Gerdes of Cleanmpg.com, was within 1% accurate.

    So, I am just wondering if the 2012 Prius has more accurate software in the system.

    alfon
     
    #1 alfon, Feb 17, 2012
  2. Paradox

    Paradox Prius Enthusiast / Moderator
    Staff Member

    Joined:
    Sep 22, 2005
    29,110
    8,591
    201
    Location:
    USA
    Vehicle:
    2014 Prius v wagon
    Model:
    Five
    Yes, we were told by Toyota at the press event last year that the 2012's will have a more accurate gauge.
     
    #2 Paradox, Feb 17, 2012
    1 person likes this.
  3. skm009

    skm009 Member

    Joined:
    Jul 5, 2010
    132
    21
    0
    Location:
    Ohio
    Vehicle:
    2012 Prius
    Model:
    III
    I only have data from two fill-ups and so far it looks like they are off by almost 7%. I know that sample is too small here but will continue to update as I get more data.

    Tank 1

    45.7(Calculated)
    48.7(MFD)
    MFD off by 6.56%

    Tank 2

    46.2(Calculated)
    49.6(MFD)
    MFD off by 7.35%
     
    #3 skm009, Feb 17, 2012
    3 people like this.
  4. Zanrok

    Zanrok Casual Prius Lover

    Joined:
    Aug 15, 2011
    176
    27
    0
    Location:
    Reno, NV
    Vehicle:
    2012 Prius
    Model:
    II
    I have 3 fill ups so far and I confirm that the gauge is off still.

    For example...
    Tank 1
    54.4 (MFD)
    51.4 (Calculated)

    Tank 2
    54.2 (MFD)
    51.0 (Calculated)

    Tank 3
    56.4 (MFD)
    52.8 (Calculated)

    Hope that helps.
     
    #4 Zanrok, Feb 20, 2012
    1 person likes this.
  5. poshunl

    poshunl New Member

    Joined:
    Feb 19, 2012
    2
    0
    0
    Location:
    winnetka
    Vehicle:
    2012 Prius v wagon
    Model:
    Five
    Prius v 5, 2012
    Tank 2 over a 264 mile freeway round trip. Average speed 70mph

    37.84(Calculated)
    41.9(MFD)
    MFD off by 9.68%
     
    #5 poshunl, Feb 20, 2012
  6. alfon

    alfon Senior Member

    Joined:
    May 17, 2009
    1,370
    270
    0
    Location:
    seaside, oregon
    Vehicle:
    2010 Prius
    Model:
    III
    Looks like the truth is in and Toyota
    did not upgrade the Prius V and regular Prius
    mpg gauge softwareto to reflect a more accurate reading.

    But, according to Wayne Gerdes, when he tested the new
    Prius C and filled up to the top of the tank, where
    you can see the gas, than drove about 60 miles round
    trip and filled up again at the same gas station and same pump
    right up to the neck again the mpg was just about
    on the money between calculated and indicated.

    I believe it was about 85 mpg.
     
    #6 alfon, Feb 22, 2012
  7. skm009

    skm009 Member

    Joined:
    Jul 5, 2010
    132
    21
    0
    Location:
    Ohio
    Vehicle:
    2012 Prius
    Model:
    III
    Dang! I thought I was going to hit the magic number 50 with this tank. Below are the details.

    Tank 3

    49.5(Calculated)
    53.3(MFD)
    MFD off by 7.67%
     
    #7 skm009, Feb 22, 2012
  8. Scott196250

    Scott196250 ScottnATL

    Joined:
    Jan 31, 2012
    10
    2
    0
    Location:
    Atlanta
    Vehicle:
    2010 Prius
    Model:
    Two
    That should be an easy software fix . . .yet it still isnt fixed. Hence, I conclude that Toyota wishes the software to remain exactly as it is. Why? So that those Prius owners who are NOT as A-R about tracking their mileage as we are will continue to feel good about their purchase and brag to their friends about their (slightly inflated) MPH.

    No?
     
    #8 Scott196250, Feb 22, 2012
  9. skm009

    skm009 Member

    Joined:
    Jul 5, 2010
    132
    21
    0
    Location:
    Ohio
    Vehicle:
    2012 Prius
    Model:
    III
    I totally agree that's the ulterior motive.
     
    #9 skm009, Feb 22, 2012
  10. SuperchargedMR2

    SuperchargedMR2 Diehard Rams Fan

    Joined:
    Feb 13, 2011
    673
    179
    0
    Location:
    Vancouver, WA
    Vehicle:
    2010 Prius
    Model:
    III
    +1

    I would say that's exactly the real truth. :mad:
     
    #10 SuperchargedMR2, Feb 22, 2012
  11. cproaudio

    cproaudio Speedlock Overrider

    Joined:
    Jul 7, 2010
    2,401
    760
    0
    Location:
    CA
    Vehicle:
    2010 Prius
    Model:
    V
    hmm 7% seems to be the magic number. If PiP has the same margin of error, when CONS reads 200mpg, it's actually 186mpg. Way to go Toyota.
     
    #11 cproaudio, Feb 23, 2012
  12. Zanrok

    Zanrok Casual Prius Lover

    Joined:
    Aug 15, 2011
    176
    27
    0
    Location:
    Reno, NV
    Vehicle:
    2012 Prius
    Model:
    II
    kind of aggravating... especially if its accurate in the C. =/
     
    #12 Zanrok, Feb 23, 2012
  13. jack520

    jack520 Member

    Joined:
    May 15, 2011
    154
    40
    0
    Location:
    California
    Vehicle:
    2014 Prius Plug-in
    Model:
    Plug-in Base
    My numbers are 46.3 actual, 49.8 on the trip computer on my second tank...
     
    #13 jack520, Feb 24, 2012
(You must log in or sign up to post here.)