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P&G at avg speed of 54 mph on hilly terrain yields 72.2 SG mpg over 30 miles

Discussion in 'Gen 2 Prius Fuel Economy' started by ystasino, May 21, 2011.

  1. ystasino

    ystasino Active Member

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    Location:
    Tucson, Arizona
    Vehicle:
    2007 Prius
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    Two
    Slight uphill accelerate so that your iMPG = MPH (12.0 kW)
    Moderate uphill accelerate so that your iMPG = 0.8xMPH (15.0 kW)
    Significant uphill iMPG as close to 0.8MPH as possible
    Moderate downhill iMPG =1.3 or 1.5xMPH (8.0-9.0 kW)
    Significant downhill use Warp stealth also known as yellow arrow condition, by feathering the gas pedal (0. 0 kW). kW were calculated using Hobbit's SG xgauge.

    Conditions: 77-82 F, windows rolled down midway, no A/C, original tires somewhat worn after 4 years at 44 psi.
    Traffic: significant but not interfering
    Distance: 30 miles
    Average speed according to MyTracks app: 54.0 mph
    MPG measured using SG II, and consistent with MFD indication when averaged with preious miles in tank.
    Terrain and speed graphs are shown below. Measurements taken reflect miles 0-30/31. At around mile 30 the SG II AVG gauge showed 72.2 MPG.

    EDIT: From some recent comparison between scangauge and MFD mpg, it seems like 72.2 scangauge MPG is more like 69 MFD mpg.

    I used to think that the Prius was much better on flat terrain, but it doesn't seem to be the case at least at these speeds.

    [​IMG]

    For anyone curious my MFD tank measurement showed 64.9 mpg after 312 miles.
     
    #1 ystasino, May 21, 2011
  2. mikewithaprius

    mikewithaprius New Member

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    Cool man! Warm weather + hypermiling = good times
     
    #2 mikewithaprius, May 21, 2011
  3. FreydNot

    FreydNot Member

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    Nice data collection. You might consider looking into doing proper screen captures on your Android phone. I use an app called "Shoot Me" to take screen shots. The only issue is it requires root access (which you have to go out of your way to do). I believe some versions of Android have a button sequence that will initiate a screen shot. What model of phone are you using?

    Attached is a shot of a recent trip from Chelan, WA to Seattle, WA...
     

    Attached Files:

    #3 FreydNot, May 21, 2011
  4. Tideland Prius

    Tideland Prius Moderator of the North
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    Impressive!
     
    #4 Tideland Prius, May 21, 2011
  5. ystasino

    ystasino Active Member

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    Thanks for your encouragement :)

    Thanks I'm already rooted and run 2.3.3 ChevyNo1 ROM based on Cyanogen on my D1. I was recently searching for this, but only found an old way of doing screenshots it wasn't just an app. Got it now and updated the image with a proper screen shot.

    That is some altitude you're negotiatinging! How do you keep your SOC low for the downhill, do you just use B when climbing down hill or maybe glide just before the top of the mountain?

    What is this bird icon in your notifications?
     
    #5 ystasino, May 21, 2011
  6. FreydNot

    FreydNot Member

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    Glad I could help. I've got a Samsung Vibrant and tried Cyanogen briefly. Since they don't support my GPS yet, I went back to a different custom ROM. Once 2.3 drivers leak for my phone and Cyanogen adds it, I'm sure I will be back on Cyanogen.

    I only take that trip once or twice a year, so I'm still figuring out what works best. I saw around 45MPG for the trip which is about what I get driving around town from Seatac to Bellevue and back. I'd love to get closer to 55 or 60MPG, but I don't think our Western Washington hills and temperatures will allow it.

    Friday it got up to 72F and I got 54MPG according to the MFD. Best MPG I've achieved since purchasing the car in December 2010. Here is that trip from Seatac to Bellevue.

    [​IMG]

    [​IMG]

    As you can see, I start at 110 feet, quickly drop to around -35 feet, climb to around 240 feet, drop down to around -35 feet again, and end up at around 318 feet. MyTracks showed an elevation gain of 929 feet, min elevation of -38 feet and a max elevation of 318 feet. Not a mountain by any stretch, but not flat either.

    As far as crossing mountain passes, I've found that the climbing lowers the SOC such that when I start the decent I have lots of room to charge. This last trip I managed to do both descents (Snoqualmie pass and Blewett pass) without resorting to B mode. As long as the traffic ahead of me was cooperating, I was able to descend fast enough that I could occasionally lightly push on the gas to take it out of regen (without using gas). On the few uphill parts of the descent I tried to use as much electric power as I could since I knew I would have an excess and if I didn't use it up, the car would burn it off by over spinning the ICE.

    The bird icon is TweetDeck. I pretty much always have new tweets so I usually have the icon in the notification bar.
     
    #6 FreydNot, May 21, 2011
  7. ystasino

    ystasino Active Member

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    So is it intentional that your speed drops precipitously at around mile 7, before the the top of the hill?

    If time and traffic allowed I would try to use as much engine as possible to only gradually lose speed until the top of the hill at mile 8 and then glide (no arrows, or engine spinning) downhill. I assume that climbing from 20 mph to 42 mph between miles 7 and 8 would result in a massive mpg hit. Your hill from mile 6.5 to 8 seems much steeper (twice the elevation over a 3rd of the distance) than mine, but it might still be worth a try to avoid such a slowdown.
     
    #7 ystasino, May 22, 2011
  8. FreydNot

    FreydNot Member

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    No, the speed drop at mile 7 was caused by slow traffic. I would have tried to use the ICE as you described if I could have. People in the Seattle area aren't very good (or efficient) drivers. They tend to slow down before a hill and really freak out when it starts to rain. You'd think we would all be used to the rain, but people never seem to.

    Also of note: I get on the freeway at around the 0.5 mile mark and exit the freeway around the 15.75 mark. I never realized the climb from the freeway exit to my office had so much elevation gain until I saw it charted out like this.
     
    #8 FreydNot, May 22, 2011
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