CleanMPG World Fuel Economy Championships - Records smashed!

Discussion in 'Articles' started by lamebums, Jun 23, 2008.

  1. phoebeisis

    phoebeisis Well-Known Member

    Initially I didn't look at the date, but when I saw "Wayne arrived in the MDX" I knew it had to be old.
    MDX is a very nice vehicle of course- quiet, comfortable ,decent enough mpg for 4400 lbs and 188."
  2. MITCH_

    MITCH_ New Member

    You Guys and Gals are amazing, I was sent here from the Solstice forum because my shifting at or below 2,000 rpms and only doing the speed limit would get my 2.4 gasoline engine around 35 MPG. If I had that extra 6th gear I know I could hit 40 mpg's

    Boy I'd like to find a way to get that even higher.

    I coast down hills, gently press on the gas, and always try to use my cruise, never going over the speed limit. well one mph.

  3. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    With those speed limit comments, you'll fit right in around here. Welcome!
  4. MITCH_

    MITCH_ New Member

    Thanks! I hope to learn some tricks from you all to raise my MPG"S even higher.

  5. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Super Moderator Staff Member

    1. Stop using cruise control. ;)

    Start your reading with the CleanMPG primer. From there you'll find lots of good information to take you as deep as you want to go.

    Feel free to ask questions. The community here is always eager to help.
  6. philhuff

    philhuff New Member

    I managed a somewhat less impressive 21.2 mpgUK / 17.6 mpgUS in a Prius last month. In contrast though, I did get it airborne.

    Cima Racing Prius Challenge :)
  7. msirach

    msirach Well-Known Member

    Welcome to CleanMPG, but I'm going to have to report you for Prius abuse!:eek:
  8. philhuff

    philhuff New Member

    Abuse? I gave it back in one piece.

    Mostly :D
  9. msantos

    msantos Eco Accelerometrist

    Abuse Indeed. :D

    It's hard to imagine many of us even achieving those MPG figures in extreme cold Arctic temperatures... so, it definitely takes a certain driving style to achieve a mileage that low. ;)


  10. Lee Turbush

    Lee Turbush New Member

    I'm new to this forum and would like to improve my mileage.

  11. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Super Moderator Staff Member

    Welcome to CleanMPG, Lee.

    To start, read the CleanMPG Primer, which will take you through introductory articles.

    Then you can introduce yourself in the Welcome To CleanMPG thread, or start a new thread in Start Your Journey Here if you have any questions. Tell us about yourself: the vehicles you drive, the area where you live, your driving patterns (how many miles, what the traffic's like, stop-and-go/interstate etc) and, of course, your current mileage and any fuel-saving techniques you're already using. We won't press, but feel free to add any background information about yourself. We're a community of people.

    There are also vehicle-specific sub-forums where you can ask specific information or share the knowledge that you gain. Posting in those sub-forums will get the attention of other owners of the same or similar vehicles.

    It helps us help you if you edit your profile and add details of your vehicle(s) (Year, Make, Model, engine size and transmission) and your location (a region will do) so that it will appear in the right-hand side of your post headers (as the Prius, Civic and Maine appear in mine). Techniques depend so much on the car, traffic, terrain and climate so it will save additional posts asking and providing information.
  12. waltermlee

    waltermlee Well-Known Member

    When the tire pressure is set at 80 psi - did you limit the top speed to 20 mph for safety reasons or do you believe that the tires could go at a higher top speed? That is - was the 80 psi setting for the Championship driving environment only?

    How did you get the Prius SoC up to 70%?
    Was that for just the first driver or was the SoC reset to 70% for each driver?
  13. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    Hi Walter:

    Burst pressure on today’s tires are many multiples of max sidewall so you do not have a safety concern here.

    Everyone took off with an initial 70% SoC in the Prius’ with both initial and final SoC recorded in order to balance the results. You can force charge a Prius to 70 + %.

  14. diamondlarry

    diamondlarry Super MPG Man/god :D

    Yes Walter, I hear a Prius can be force charged to about 83%.;) I have had multiple 10's of thousands of miles both local and highway at 80 psi (occasionally higher) with no safety issues and no uneven wear.
  15. waltermlee

    waltermlee Well-Known Member

    Thanks for your quick response. I'm a scary cat so I have
    been only gradually upping my tire pressure ( I'm currently
    testing out 50psi/48psi). My concern is not that the tire air
    seals will fail but that road handling/braking performance
    might degrade or change in such a way that I am unable
    to compensate for it. I am using stock Yokohama Avid
    S33 ( max sidewall is 44 psi).

    I read that Toyota engineers forced the SOC up by
    stopping from a very high speed. Is that how you forced
    a charge on the Prius or did you use a battery charger?

    Walter Lee
    2010 Toyota Prius III, oem floormats
    Ribbon Blue/Dk Grey
    ScangaugeII (AVG/MPG, Fwt, SoC, GPH)
    Yokohama Avid S33 (50/48)
    odeometer +13000 miles/59 mpg overall
    MD/DC/VA metro area
    Last edited: Jun 22, 2011
  16. waltermlee

    waltermlee Well-Known Member


    Thanks. As a hypermiler neophyte - the safety issues is my
    own driving skills and whether I respond correctly to a given
    driving condition which is why I am only slowly upping my
    tire pressure so that I can get a feel of any difference in
    handling. I am using Yokohama Avid S33 on a 2010 Prius 3.

    Last December, I had upped my tire pressure
    to 50/48 psi. While it was raining on a downhill section of
    a curved crowned asphalt road (Nicholson Ln, North
    Bethesda,MD) an SUV merged in front of me and
    shortly afterwards stopped to make a left turn. While I
    had more than enough distance to stop on the wet
    downhill - the Prius shook/vibrated briefly as I braked
    hard from 35mph to 0mph. I had stopped about 20 feet
    behind the SUV so I had enough distance behind me
    but the vibration suggested that the ABS was operating
    because I had lost some traction. After that incident,
    I dropped my tire pressure to 44/42 psi. With drier
    weather, I have upped my tire pressure back up to 50/48
    with a keener focus on having a longer stopping distance
    when driving on wet roads.
  17. diamondlarry

    diamondlarry Super MPG Man/god :D

    To answer your question about how the Prius' were force charged, it is done by putting it in D then, while holding the brake pedal down, you press on the gas. A couple of years ago, I ran an experiment with my Prius where I left home with some recycling stuff and when I got there(approx 7 miles away), I forced charged to the full capacity. On the way back, I had 255 mpg showing on the Scanguage. When figuring in the fuel used while charging, it came to 103 mpg for the round trip. For me, this was almost a wash since that is about what I could usually do.
  18. waltermlee

    waltermlee Well-Known Member

    Wowser! What a neat Trick!
  19. Harold

    Harold Well-Known Member

    Run that by me again! Force charge a Prius by applying the brake and hold the throttle down? Are you at a stand still when you do this and how much gas do you give it?? H
  20. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    Don't bother. It didn't actually save any gas. It only gives a huge number if you ignore the gas used to force a high SOC.


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