Better mileage when not in eco mode

Discussion in 'Prius v Fuel Economy' started by gone2green, Jan 9, 2018.

  1. gone2green

    gone2green grumpier than the grumpiest old man you know ;)

    Joined:
    Mar 9, 2007
    105
    12
    0
    Location:
    Mesa AZ
    Vehicle:
    2015 Prius v wagon
    Model:
    Three
    We traded in our 2007 prius for the 2015 prius v in July last year, and have noticed we get better mileage when the eco mode is off. Is that strange, normal, or what?
     
  2. Prodigyplace

    Prodigyplace Senior Member

    Joined:
    Nov 1, 2016
    6,047
    5,615
    0
    Location:
    Central Virginia
    Vehicle:
    2017 Prius
    Model:
    Two
    Some people find driving mode affects mpg, others find it does not. My son, who has 2015 Prius v 5, thinks Eco mode on my Gen 4 is like PWR mode on the Prius v.
    I generally drive my Gen 4 in Normal mode (between Eco & PWR). I think my mpg may be slightly better because I do not need to push the accelerator as far.
    Some people here have tested the SmartPedal to improve mpg. It smooths out accelerator movement, removing movement due to road imperfections.

    SmartPedal | SmartPedal
     
  3. Aaron Vitolins

    Aaron Vitolins Senior Member

    Joined:
    Feb 28, 2014
    1,065
    548
    0
    Location:
    Nashville TN
    Vehicle:
    2012 Prius
    Model:
    Two
    I noticed the same thing! I think the problem is that you would loose to much momentum while driving with eco and end up accelerating more than you would.

    And the V has so little power to work with, eco mode means pushing the peddle down a lot!
     
    GregC1979 likes this.
  4. rdgrimes

    rdgrimes Senior Member

    Joined:
    Jun 7, 2013
    1,595
    363
    4
    Location:
    New Mexico, USA
    Vehicle:
    Other Hybrid
    This is about throttle control and nothing else. (If your driving style lends itself to use of one mode or the other.) What gives you the best MPG is simply a matter of how much time/miles you spend in EV mode. So if you accelerate quickly and get into EV mode sooner you'll probably improve MPG. You can do the same thing in ECO mode, you just have to give it more pedal, which some people tend to resist doing.

    ECO mode actually offers you a greater energy savings due to several different functions, but if it causes you to stay out of EV mode more often, its not working for you.
     
  5. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

    Joined:
    Oct 17, 2010
    23,522
    12,492
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    ECO Mode is a misnomer, for the most part. It apparently does some behind-the-scenes adjustments to AC performance, but it's main effect is to increase gas pedal travel. With our (regular) 3rd gen, I found the ECO pedal travel excessive, if anything, it was more difficult to modulate. "Normal" (neither ECO or PWR) has a nice linear feel, find by me.

    4th gen's have apparently shifted the gas pedal travel in the various modes, by roughly one mode towards more agressive? If so, then I'd likely prefer ECO in 4th gen. If I ever get there.
     
    Baltimore66 likes this.
  6. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

    Joined:
    Nov 3, 2012
    1,841
    594
    0
    Location:
    Sanford, NC
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    I thought that AUTO mode was what adjusted the HVAC.
     
  7. Prodigyplace

    Prodigyplace Senior Member

    Joined:
    Nov 1, 2016
    6,047
    5,615
    0
    Location:
    Central Virginia
    Vehicle:
    2017 Prius
    Model:
    Two
    On Gen 3 (& prior?) the Drive Mode adjusts the HVAC to Eco. On Gen 4, you can also change the HVAC ECO mode separately.
    I drive in Normal Mode with ECO HVAC.
     
    Mendel Leisk likes this.
  8. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    10,375
    4,023
    90
    Location:
    Western Washington
    Vehicle:
    2012 Prius
    Model:
    Three
    Normal.

    Apart from some minor adjustments to ancillary systems (climate control, cruise control, engine auto-stop temperature thresholds), ECO / Normal / PWR modes are just different user interfaces at the gas pedal. Different 'touch and feel'. They have no impact on the actual propulsion system operation.

    An 'ideal' driver -- zero reaction time, infinite patience, perfect coordination and dexterity and foresight-- should be able to get the same results in all three modes. But when common human frailties are added in, then results diverge. Since different people have different driving styles and limitations, they will end up with different results and preferences.

    A plurality of drivers will get best MPG in ECO. Some (but fewer) will do better in Normal or PWR. And a few (but not many) will even be close enough to the ideal computer-like operator to achieve the same in all modes. Then others don't even care about any MPG differences, but go for seat-of-the-pants feel.

    Use whatever mode suits you best.
     
    #8 fuzzy1, Jan 9, 2018
    Last edited: Jan 9, 2018
  9. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

    Joined:
    Oct 17, 2010
    23,522
    12,492
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I'm really not sure about that, or at least: the variations are miniscule enough to be "lost in the noise". Especially between ECO and Normal, and more so if you rarely use AC.
     
  10. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

    Joined:
    Nov 3, 2012
    1,841
    594
    0
    Location:
    Sanford, NC
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Never driven a Prius hatchback of any generation. I can only speak of my 5 years with a v and how the controls seem to work. On other versions of a Prius they may be different. In the first few months, I tried to learn what such a different car wanted, for the next few years, I tried to be conscious of what I did without being seen by any other driver as different. On a once a week 50 mile one way trip, I went from 65 in a 70 when I could without obstructing anyone to 68. Now I seem to be at 70 or maybe 72 but then traffic is heavier and it takes that to not obstruct. Or that is my rationalization. My MPG has suffered.
     
    Mendel Leisk likes this.
  11. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

    Joined:
    Oct 17, 2010
    23,522
    12,492
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Kinda like trying to blend in with the walking dead...
     
    Prodigyplace likes this.
  12. GregC1979

    GregC1979 Junior Member

    Joined:
    Oct 1, 2017
    72
    27
    0
    Location:
    Placentia,Ca
    Vehicle:
    2012 Prius v wagon
    Model:
    N/A
    Here's mine, all in "Normal" mode. Same tank was 315 miles at exactly 1/2 tank.
     

    Attached Files:

    Aaron Vitolins likes this.
Loading...