Niro does well in this comparison!

Discussion in 'Kia Niro' started by davidtm, Jan 14, 2020.

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  1. TandM

    TandM Active Member

    The calculation for range on the GOM (Guess-O-Meter) is not a straight number of mi/kWh times battery size (it takes into account recent driving history for how economically you drive, where you are heading if you have the destination set, temperature, etc) .

    A few key differences, I have both winter packages meaning my efficiency would be different than yours (I am thinking that at 55° outside you were probably running heat). I am pretty sure I have my ACC set to normal (I can check that tomorrow if needed) but I know my regen is set to 3 (because I like it aggressive and I drive a lot of hilly routes into the foothills of the Appalachians so I want to capture back all the power I can on those downhills). I rarely make short trips (all of your calculations are very short trips).

    I have one drive in particular (which I had just made before the photo above) that I really have no traffic (there are times I make the drive that I probably see just a 50 cars or less in 100 miles on the highway - the drive is about 350 miles round trip with only about 5 miles not being interstate or state highway) so I have no change in speed due to braking for people (though one trip did involve stopping for a cow).
     
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  3. Glad your values are similar. For a moment I wondered if I had something wrong with my vehicle. Well, I will try the same experiment at lower speed. Air drag does scale as v^2 so net force against the motor should be Cv^2 + F_r where F_r is rolling resistance. F_r is pretty small based on how far I can coast with regen braking off so I suspect improvement will be ~25% or about 4.6 kWh/mi. I will let you know. As for whether it is worth it, we can pick that up after we have more data.

    Meanwhile....
    conjured up something bizarre in the recesses of my twisted mind.

    C: Oh, heaven forbid: I am one who delights in all manifestations of the Terpsichorean muse!
    O: Sorry?
    C: 'Ooo, Ah lahk a nice dance 'yer forced to!​

    http://www.montypython.net/scripts/cheese.php

     
  4. niro525

    niro525 Member


    I get similar results of 2.9-3.8 mi/kWh. The lower efficiency in my experience is from higher % normal driving and freezing temps.

    David, temp could be a confounder. TandM lives in 84F climate. Isn't the optimal temp for the NCM battery around 75F?


    David, also have you seen the paper (dx.doi.org/10.1021/am506712c)?
     
  5. wizziwig

    wizziwig Active Member

    Our numbers are all in the ballpark for typical highway travel (well under 4 miles/kWh). TandM's results are an anomaly that I'm not going to try explaining because there is not enough information provided. His photo doesn't show the trip computer so can't tell the average speed. We don't know the wind conditions. We don't know the elevation changes. Temperature does play a huge role and 84 degrees not only helps the battery chemistry but also reduces air density which helps lower drag. Climate controls add more complexity. This is why I said earlier there are way too many variables to compare EV range between different owners and conditions unless you have a very large sample size or can conduct the tests under controlled and repeatable conditions (such as the indoor EPA test cycles).
     

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