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27.9 EV Miles Max for Prime?

Discussion in 'Prime Main Forum (2017-2022)' started by dlegate, Feb 27, 2018.

  1. dlegate

    dlegate Junior Member

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    I noticed today as I was fully charged and heading down a steep hill that my EV miles remaining was at 27.9 at the top of the hill and didn't go any higher, when I expected it to continue to climb because of B mode and braking. I figured, well, the battery can't hold *more*, so it's maxed out.

    Then at the bottom of the hill, I made a quick right turn and accelerated into traffic, and traveled a good mile and it stayed at 27.9 the entire way, which I was expecting to see it drop quite a bit due to the speed I was demanding.

    Does the meter simply stop displaying anything above 27.9 miles, but the battery still holds more?

    Sure seems that way. Anyone else have a similar experience?
     
  2. xray22

    xray22 Junior Member

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    I can't explain that phenomenon but I can tell you that I've seen my meter go up to 33 miles after charging (in the summertime).
     
  3. bisco

    bisco cookie crumbler

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    the 'meter' is not a gauge of how far you can drive in ev. it is a calculation of previous drives plus ambient temperature.
    still, it should go up if your battery is charging. it may be that the battery was full, and wouldn't accept anymore charge.
     
  4. dlegate

    dlegate Junior Member

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    Interesting...

    Not sure I understand how the "calculation of previous drives plus ambient temperature" is a good estimate, though.

    Although getting 33 in summertime does seem to lend itself to the ambient temperature statement.

    Guess I'll have to keep watching it. Thanks to you both for the feedback!
     
  5. Wuzki

    Wuzki Member

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    How can you get 33 out of ev mode lol... no matter how I drives it I only can max out at 21miles :(
     
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  6. bisco

    bisco cookie crumbler

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    it depends on speed, acceleration, terrain, weather, hvac and etc.

    try driving 20-30 mph on quiet back roads sometime.
     
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  7. bisco

    bisco cookie crumbler

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    it an't unless you drive the same commute all the time, and etc.
    there's no way for a software program to accurately convert battery charge into driving distance, since different types of driving require more or less energy.

    so instead, they just average past performance, and assume your next drive is going to be close to that average. sometimes it is, and sometimes it isn't.
     
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  8. Oh I've seen it go higher... wait until summer and fall:

    IMG_0049.PNG
     
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  9. Wuzki

    Wuzki Member

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    That is impossible speed to do in my areas. Max road speed 50-55. Lol I should had buy ev bicycles, if I’m rolling on 20-30 mph
     
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  10. Gianni I

    Gianni I Member

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    Interesting conversation as i've had mixed results as well. I plug in at home and plug in at work. My commute is 23.5 miles each way. On the way in to work the most i've ever made it on EV only is with about 1 mile to spare. This morning I actually ran out of EV a mile before I got to the office. On the way home, however, I've had almost 6 miles to spare and I don't think i've ever run out of EV.
    Speed plays a huge part of it as well as weather. I got my Prime end of Dec so I've yet to experience the great milage of summer time. I've gotten close to 27-28 on 50 degree days so I assume that will easily go up during summer time.
     
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  11. huskers

    huskers Senior Member

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    Now that the weather is in the 40s I am getting 28/29 EV range again. Will be in 30s soon.
     
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  12. bwilson4web

    bwilson4web BMW i3 and Model 3

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    I use the SOC and current %/mile but then I need something to entertain me when driving.

    Bob Wilson
     
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  13. bisco

    bisco cookie crumbler

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    beatles?
     
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  14. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Severely married, I often drive with ‘terminator’ vision. My wife doesn’t understand it either.

    Bob Wilson
     
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  15. dlegate

    dlegate Junior Member

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    Very interesting! Makes sense. Thanks!
     
  16. Digloo2

    Digloo2 Active Member

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    It's clearly adaptive. Mine started out at 19, and now shows 28+ after charging, apparently based on my driving habits.
     
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  17. Oniki

    Oniki Active Member

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    The range meter is no where near as granular as a drive down and up a hill would require to see a change, and that is a good thing.

    Think of it this way: your car has been averaging 29 miles EV per 5.5 kWh for a consumption rate of 189.6 Wh per mile.
    Now you go down a hill, say for 0.2 miles and perhaps gain 100 Wh into the battery. Your new average consumption is 29.2 miles from 5.4 kWh, for a consumption rate of 184.93 Wh/mile. Your consumption per mile rate has improved about 2.5% and so your range will be 29/0.975 = 29.7 miles.

    Not a lot of change, as your can see. The car is not showing the difference because the improved consumption is only during a small fraction of the distance it monitors. If you keep up the lower consumption the software will slowly update the expected range to reflect the presumed future lower consumption.

    But in your actual driving the consumption rate jumped after the downhill, in a sense telling the computer it was right to ignore the first blip ... and the second one too. The alternative is for the range meter to jump up down from a range say of 5 miles to 100 miles with every terrain or acceleration change. You have the instant consumption meter for that data. The range meter is instead trying to guess how far you will go over the next 5 kwh of consumption, and for that it looks backwards over the most recent 5 - 10 kWh.

    I'm not positive, but the range calculation may occur each charge. In between there actually is an acknowledgement by the computer of a range change but it is a little subtle: you range per full charge is the sum of miles driven and miles remaining. If you drove e.g 0.5 mile and the miles remaining stays the same, the computer has estimated that your full charge range has increased by 0.5 mile.
     
    #17 Oniki, Mar 17, 2018
    Last edited: Mar 18, 2018
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  18. a_gray_prius

    a_gray_prius Rare Non-Old-Blowhard Priuschat Member

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    Our Prime regularly reads 31 miles range after a full charge.
     
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  19. benagi

    benagi Active Member

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    Since the weather has warmed a bit here in SLC, I’ve been seeing 34 miles per charge.
     
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  20. Garmy

    Garmy Junior Member

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    I regularly get 36 on my entune display here in FL. In car it will read 32. Anyone get higher readings?