Real World MPG Numbers

Discussion in 'Gen 4 Prius Fuel Economy' started by krmcg, Jan 22, 2016.

  1. krmcg

    krmcg Lowered Blizzard Pearl Beauty

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    MPG.jpg First Fillup Data:
    650 miles
    10.211 gallons (first click)
    63.66 calculated MPG
    64,9 MFD MPG
     
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  2. bisco

    bisco cookie crumbler

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    shaweeeeeeeeet!!!!!(y) next tank will be even more interesting.
     
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  3. pakitt

    pakitt Senior Member

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    This is not a full statistics, but it seems that the EPA numbers are quite conservative......
     
  4. bisco

    bisco cookie crumbler

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    yes, that is what some reviewers have said as well.
     
  5. retired4999

    retired4999 Prius driver since 2005

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    Nice! Keep up the good work. :)
     
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  6. GaryD1

    GaryD1 Active Member

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    U started getting better gas mileage with the last half of tank, u were getting 62 something, so you actually got a lot more MPG the last half, more that 64.9, do you agree? OIC now, you were actually getting 69mpg the later day. How did you do that?
    merged, though you quoted yourself
     
    #6 GaryD1, Jan 22, 2016
    Last edited by a moderator: Jan 25, 2016
  7. krmcg

    krmcg Lowered Blizzard Pearl Beauty

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    The gas mileage got better as the days went by. Less weight from less gas? Learning curve? In the cool mornings I get about 60 MPG, then on the way home I get in the high 70's. More down hill? Not sure. But that gives me the high 60's daily average.
     
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  8. GaryD1

    GaryD1 Active Member

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    will be interesting how some of these two eco mileage reports come in. I was looking on web site today in Wilmington, NC today. They had 2, two eco cars in stock and didn't check to see how many of the other styles they had. Our weather here has been terrible today, 25 degree right now with 3 inches of ice on ground and more expected tomorrow. Our 2011 two is still going strong, 156k without any problems. This is the car we will use at end of year to sell or trade in on the eco probably. I wish I had held off buying the 2015 and went with 2016, but got a good deal. I just looked, they have 16 prius, 2016 in stock
     
    #8 GaryD1, Jan 23, 2016
    Last edited: Jan 23, 2016
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  9. David Beale

    David Beale Senior Member

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    I would say the car is "learning". As it learns, it gets better mileage.
    I would also say the driver is "learning". As he learns, he is able to get better mileage.
    Also, breakin will lower losses, so mileage will improve slightly.

    And this is exactly what I would expect to happen. :)
     
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  10. krmcg

    krmcg Lowered Blizzard Pearl Beauty

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    Four days in a row. Can't quite get to 70. ImageUploadedByTapatalk1453598984.066151.jpg
     
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  11. bisco

    bisco cookie crumbler

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    i don't understand how cars 'learn'.

    i don't think the driver is learning, this not being the first prius.

    i don't think you can break a car in on half a tank of gas.

    but what do i know.
     
  12. CR94

    CR94 Senior Member

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    The tires, at least, will certainly improve significantly in rolling resistance well beyond that point. Other mechanical bits, maybe.
     
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  13. David Beale

    David Beale Senior Member

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    Cars learn by storing the settings for fuel mixture etc. as they are driven. The computer can compute the setting "on the fly", but that takes time and some efficiency is lost due to that time. Once the car "learns" how the driver is using it, storing the settings, it can use the stored settings, which load almost instantly, thus improving efficiency vs time. Yes, the car comes with those settings already stored, but every engine is slightly different. The car will over-write the "factory settings" in that matrix with it's own calculated ones, which work better (usually). Actually, there are two matrixes, no wait, three, in the computer. But I digress. At any rate, the computer will use the computed setting (if available), and that results in higher efficiency.

    Breakin slows as the car is driven. The biggest breakin effect happens right away. The effects lessen over time operated. So for the first 100 mi. or so you can really see the effect. Most owners are so busy learning where the controls are and watching how the car works, they don't notice the breakin effects. But you can sure see them in the numbers the GIV is storing in that display! "Getting better all the time" to quote the Beatles. ;)
     
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  14. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Reads like the prolog for the VW-gate tuning of the cheat-diesels. <GRINS>

    Hummmmm, wonder what default software settings are in the latest 'Prius-killer', the IONIQ. <Uh Oh!>

    Bob Wilson
     
  15. Former Member 68813

    Former Member 68813 Senior Member

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    what kind of driving? what mean MPH? i don't see it displayed (unlike gen 3).
     
  16. Starship_Enterprius

    Starship_Enterprius Active Member

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    krmcg...since everybody drives differently, what kind of numbers were you getting with your previous gen Prius? That probably will give us a better idea how much better the new one is over the old one mileage wise. Thanks!
     
  17. krmcg

    krmcg Lowered Blizzard Pearl Beauty

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    My lifetime average for the 2008 Prius was 52.0 MPG per the computer display. (Actual computed MPG 50.52) For all driving roadtrip and all.
    Based on apples V. apples comparing of the same route with similar weather I would expect to get 55 MPG on the computer display and about 53 computed on the 2008. That said, the improvement seems to be in the 18% to 20% improvement from Gen 2 to Gen 4.
    merged
    My commute is about 50% highway and 50% surface street driving both with light traffic. I'll look today, but I expect that the average speed is just under 30 MPH. I do have one big hill close to home that seems to hurts my moring commute more than my afternoon drive.
     
    #17 krmcg, Jan 25, 2016
    Last edited by a moderator: Jan 25, 2016
  18. dorunron

    dorunron Senior Member

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    Interesting stats, thanks for the post and the info! (y)
     
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  19. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    Real World, to me, means ignoring the MDF and hand calculating.

    Don't get me wrong.
    64.9MPG over 650 miles is good stuff, but my G3 sometimes puts a thumb on the scale where mileage is concerned, which is why I learned to ignore the MDF numbers and hand calculate every time I fill up.
    Since I always load about 10 gallons of fuel plus or minus a Slurpee's worth, the math is fairly easy.
    The G4 seems to be handily beating the EPA estimates with early adopters....just like the G3 did when it first came out.
    According to Fuelly, the G3 just about splits the uprights where EPA efficiency is concerned out in the real world and over the six years that G3's were made, which also matches my personal experience. I also noticed that my driving technique grew a little more slothful where fuel efficiency is concerned over time (2010 to present) and MY numbers slipped from about 60MPG tank-to-tank to low 50's over time.

    I'm also wondering how G4's will fare is the annual battle with old man winter and differing fuel blends.

    Right now gas prices are $1.39 in my neck if the woods.
    Any way you measure it....they might trough out at about a buck again before the summer driving season, but before the G4 gives way to the next generation of Prius you can just about count on another period of high gas prices.

    Even at $1.39.....the stuff is too expensive to waste!

    Good Luck!
     
  20. alfon

    alfon Senior Member

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    I believe the 2016 Prius mpg gauge is right on the money, maybe even more conservative than hand computed mpg numbers. This is from cleanmpg.com Wayne Gerdes observations....
     
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