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How to calculate EV

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by Chris11, Feb 13, 2013.

  1. Chris11

    Chris11 Member

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    Like most others that I've read about on here my EV has gradually dropped from 14.xx until now that I read 9.8 miles each morning.

    My theory is that it's based on average mph over the lifetime miles of the car, .... not how we drive, how we accelerate, how we fart, etc.

    I'd like to see how everyone's max mph/miles driven matches up to this theory.

    I'll start it off.

    Miles on car ................20,500 (Rounded Off)
    Average Speed since new, according to "B" which I leave alone. 46 mph.

    Please post yours.
     
    #1 Chris11, Feb 13, 2013
  2. RBooker

    RBooker Member

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    ~1300 miles
    avg mph 20
    EV range 8.7
    Calculated mpg 120.9
     
    #2 RBooker, Feb 14, 2013
  3. bisco

    bisco cookie crumbler

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    can you show how the equation works out to 9.8? thanks! unfortunately, i don't save a or b, just ev ratio.
     
    #3 bisco, Feb 14, 2013
  4. Chris11

    Chris11 Member

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    Sorry, I wasn't clear. My EV range on the display after charging reads 9.8.

    But according to my theory the slower average MPH should result in higher EV range. RBooker's result shows so far that my theory isn't correct. :)
     
    #4 Chris11, Feb 14, 2013
    lensovet likes this.
  5. Tracksyde

    Tracksyde Member

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    Temperature plays a big role in how much energy the battery can hold. So those responding might want to include their geographical area and if possible, temperature. Weather (snow or rain), makes a big difference as well, obviously.
     
    #5 Tracksyde, Feb 14, 2013
  6. usbseawolf2000

    usbseawolf2000 HSD PhD

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    For the 20,500 miles, what does your EV Driving Ratio screen look like? Using the numbers there, we can calculate how much electricity per mile you are using.
     
    #6 usbseawolf2000, Feb 14, 2013
  7. AvLeg

    AvLeg Junior Member

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    My range started out around 13-14 last Nov. and dropped to around 9.5 with freeway speeds. After changing route to work and lowering commute speeds to around 35-40 mph my range came back up to 12.5. All in how you drive and how much energy per mile is expended.;) Prob will improve as spring and summer get here... So far have 3500 mi on car.
     
    #7 AvLeg, Feb 14, 2013
  8. bisco

    bisco cookie crumbler

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    i was at 12.1 today and my ev/hv is 3887/3368, temps have been mostly mid 20's to mid 30's.
     
    #8 bisco, Feb 14, 2013
    retired4999 likes this.
  9. ukr2

    ukr2 Senior Member

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    Since March 14 last year, I've driven the same route Mon-Fri.
    My estimated EV started at 13.3 in March, down to 10.8 in May, rose to 12.1 through the Summer, and dropped thru the Winter to 9.4 today.
    So OA Temp has a lot to do with it, since my driving habit hasn't changed.
     
    #9 ukr2, Feb 14, 2013
    retired4999 likes this.
  10. bisco

    bisco cookie crumbler

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    one thing i know for sure, it's pretty accurate. when it was reading 16.something, i was getting 16-17. now that it's reading 12, i'm getting 12-13.
     
    #10 bisco, Feb 14, 2013
  11. Chris11

    Chris11 Member

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    I just went out and looked. Life of the car .... 10% EV and 90% HV. And this morning my estimated EV range was down to 9.6 and after getting home today and charging again, it was 9.6 again.

    I think you guys are right about the temp being important.
     
    #11 Chris11, Feb 14, 2013
  12. usbseawolf2000

    usbseawolf2000 HSD PhD

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    What about the miles breakdown and kWh/gallon breakdown?
     
    #12 usbseawolf2000, Feb 15, 2013
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