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Gliding in a 2001 Prius

Discussion in 'Gen 2 Prius Fuel Economy' started by claremontprius, May 17, 2007.

  1. claremontprius

    claremontprius New Member

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    Hello All,

    I have been reading these forums to see if the P&G technique was unique to Prius with the HSD and not the Prius THS (gen 1). I have a 2001 Prius which currently averages 47.8 mpg. In an effort to push it further, I was trying the P&G but cannot seem to get rid of the energy flow arrows at all like this article describes:
    http://www.cleanmpg.com/forums/articles/t-...m-fe--1224.html

    My question is this: does it work on the Prius 1 and if so how do I do it? Every time I accelerate to say 30 mph and take my foot off the pedal, the green arrow points from the wheels to the battery. When I push ever so slightly on the pedal the red arrows point from the battery to the wheels. No combination of pedal strokes ever gets rids of the the arrows all-together.

    Thanks.

    KP
     
    #1 claremontprius, May 17, 2007
  2. Tideland Prius

    Tideland Prius Moderator of the North
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    what about neutral?
     
    #2 Tideland Prius, May 17, 2007
  3. claremontprius

    claremontprius New Member

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    <div class='quotetop'>QUOTE(Tideland Prius @ May 17 2007, 10:18 AM) [snapback]444260[/snapback]</div>
    Haven't tried that yet (but I think my owner's manual recommends against it.)
     
    #3 claremontprius, May 17, 2007
  4. subarutoo

    subarutoo New Member

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    <div class='quotetop'>QUOTE(KBP @ May 17 2007, 10:34 AM) [snapback]444273[/snapback]</div>
    Neutral coasting is against the law in most states, and is also about the same as flat towing (wheels on the ground), which the Prius, and most other car manuals recommend against. Its also kinda dumb.
     
    #4 subarutoo, May 17, 2007
  5. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(KBP @ May 18 2007, 02:09 AM) [snapback]444256[/snapback]</div>
    Your observation is correct and its behavior is well-known among Japanese NHW-11(classic Prius) drivers.
    We believe the display hysteresis is very narrow on NHW-11 and wide on NHW-20.
    We observe some amperes are consumed on NHW-20 when we see no arrow on MFD.
    So, my recommendation is do not be nervous about the deadband gliding, and you can glide with a light touch of pedal using very small amount of battery power.

    Ken@Japan
     
    #5 ken1784, May 17, 2007
  6. claremontprius

    claremontprius New Member

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    <div class='quotetop'>QUOTE(ken1784 @ May 17 2007, 08:39 PM) [snapback]444623[/snapback]</div>
    So, Ken, is there a technique unique to the older Prius? I am getting just 48 mpg so far. No where near the 60-100 that people post here! :)
     
    #6 claremontprius, May 20, 2007
  7. bwilson4web

    bwilson4web BMW i3 and Model 3

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    <div class='quotetop'>QUOTE(KBP @ May 20 2007, 09:49 PM) [snapback]446389[/snapback]</div>


    I also have an NHW11, 2003 Prius, and have a few suggestions. First about your mileage expectations, here is the GreenHybrid database list. Getting 48 MPG is above the median and not bad. However, you can do better.

    I would recommend any of the various FAQs about and pay particular attention to maintenance. I'm keeping this FAQ up and you are welcome to ask questions about it.

    BTW, if you have a low traffic route with at least a couple of miles or a loop, say an industrial park, try driving at a steady speed of 18-20 mph. The consensus is this is the maximum distance, speed range for a Prius. Anything faster or slower gets progressively worse mileage.

    GOOD LUCK!
    Bob Wilson
     
    #7 bwilson4web, May 21, 2007
  8. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(KBP @ May 21 2007, 11:49 AM) [snapback]446389[/snapback]</div>
    Basically, there is no difference between NHW-11 and NHW-20 except an EV switch.
    The NHW-11 uses about 10% more fuel than NHW-20.

    Ken@Japan
     
    #8 ken1784, May 21, 2007
  9. prosec34

    prosec34 New Member

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    I'm no expert on the Prius computer, but my experience so far with my '02 Prius (purchased last December) is that gliding works. Where I live, there are many hills, and what I do is lay on the accelerator to go up, and then I let go and quickly get back on very lightly. This disengages the gas motor and engages the electric motor. I can then go much farther down the hill and onward while getting 100+ MPG during that stretch.

    In the end, your average MPG is much better this way than if you maintained a constant speed. I've had tanks where I averaged 55, and in the winter, I had some where I averaged 47 or so.

    It is much easier to glide around on the hilly country roads where I live than, say, on a long flat stretch of interstate.
     
    #9 prosec34, May 22, 2007
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