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CHALLENGE: Advertised Range Rating Discrepancies

Discussion in 'Model S' started by taylorogan, Aug 14, 2018.

  1. taylorogan

    taylorogan Member

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    This is for you engineering/math/Tesla nerds in this group. (I just called Tesla and asked them this question and they are stumped. They even "asked the factory".) Let's see who can answer this one.

    In the USA, the range Tesla advertises across all vehicles is based on the EPA rating of 300Wh/mi. Here's the question: what is it in China?

    Here is what I pulled from the design studio from tesla.com and tesla.cn.

    Screen Shot 2018-08-14 at 1.26.11 PM.png

    It seems that Tesla advertises very different numbers for the same cars. For example, a Model S P100D in America, rated at our standard 300Wh/mi, is advertised with a range of 315mi. That SAME car, as advertised by Tesla in China, has a range of 345mi. That's 39mi (112%) more range in China than in the US. Moreover, the range difference is different for every model! So a Model X 100D in America has a range of 295mi, but in China has 343mi, for a difference of 48mi (116%).

    First person to figure this out wins.
     
  2. JohnnyG

    JohnnyG Weee!

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    #2 JohnnyG, Aug 14, 2018
    Last edited: Aug 14, 2018
    I don't believe it is calculated at 300Wh/mi for every car, as different configurations have different efficiencies.

    For example: I believe my P90DL is rated at ~315Wh/mi.

    Also, each country has it's own rating mechanism. Here in the USA, it is the EPA. In Europe it is the NEDC.
     
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  3. taylorogan

    taylorogan Member

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    Go look at your car right now. I am on my third Tesla, and in all of them it was 300Wh/mi.
     
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  4. TexasEV

    TexasEV Well-Known Member

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    The premise of your question is wrong. Tesla does not calculate the rated range of each car based on a fixed 300 Wh/mile. It’s different for each car and battery. For example my S60 rated range was based on 285 Wh/mile.
     
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  5. JohnnyG

    JohnnyG Weee!

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    Don't need to. It is not.
     
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  6. MP3Mike

    MP3Mike Well-Known Member

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    Tesla uses a different range calculation in the UK as well.
     
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  7. Petra

    Petra Member

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    Nope, rated is 290Wh/mi. in my pre-refresh S70D.
     
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  8. taylorogan

    taylorogan Member

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    How do you know?
     
  9. taylorogan

    taylorogan Member

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    Here are three different cars.
     

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  10. brianman

    brianman Burrito Founder

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    In your first and third images, the rated line is clearly below the 300 line. I would guess 295.
     
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  11. MP3Mike

    MP3Mike Well-Known Member

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    You could do a little searching on the forum... You might find this thread: Calculate usable battery capacity based on rated miles values

    With this information:
    Of course that is all for US cars...
     
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  12. taylorogan

    taylorogan Member

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    Okay, so this would be the updated one:
     

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  13. brianman

    brianman Burrito Founder

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    11 Electric Cars With Most Range
     
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  14. Olle

    Olle Member

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    #14 Olle, Aug 14, 2018
    Last edited: Aug 14, 2018
    Any car manufacturer's listed consumption will vary widely depending on what country site you visit, different countries have different requirements for how to measure fuel consumption. USA has EPA for example. (btw it's not 300 Wh/mile for all Teslas)

    No Engineering or math needed, but Challenge solved :)
     
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  15. ucmndd

    ucmndd Member

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    Advertised range is based on local regulation and test cycles. In the USA, advertised range uses the EPA test cycle. In Europe the NEDC cycle is used. Not sure what China is, but you can be sure there's local regulation at play.

    This isn't a mystery. It's been this way forever.
     
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  16. JohnnyG

    JohnnyG Weee!

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    Not that this is necessary, but what the hell, I'm having fun :D

    The thin bottom line is 300Wh/mi.
    The thicker line above that is "Rated".
    The dashed line is obviously 320Wh/mi.

    I'll let you get out the measuring stick and guesstimate the exact value of "Rated".
    I've caught it right on the line at ~316Wh/mi, and just below the line at ~312Wh/mi.

    20180530_213408.jpg
     
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  17. MP3Mike

    MP3Mike Well-Known Member

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    They are transitioning to WLTP instead of NEDC, which if I recall correctly has to be used starting 9/1/2018.

    It will be interesting to see how Tesla handles that. Will they update the range estimate calculation on all EU Teslas to WLTP, or will they really do it just for ones registered on/after 9/1/18?
     
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  18. JohnnyG

    JohnnyG Weee!

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    Ohh! That is interesting... I would guess (literally a guess) that they would have to stick with whichever numbers the car was sold with, to maintain legality. At a minimum, they couldn't do it for all Teslas across the board in Europe, because the EU would have to run the WLTP tests on all configurations to provide Tesla with their numbers. They wouldn't be able to run it on anything that's not current production, as they wouldn't have a new, untouched car, to test.
     
  19. brianman

    brianman Burrito Founder

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  20. appleguru

    appleguru Member

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    Apparently :p

    When I'm on mobile I tend to fat finger the disagree button, sorry! (Is actually hilarious/awesome that we have a disagree button on the forums...)
     
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