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What are you getting for Wh / mile at 80 mph?

Discussion in 'Model 3' started by ZeApelido, Aug 31, 2018.

  1. ZeApelido

    ZeApelido Member

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    I've done just a bit of testing, and was getting between 285 and 290.
     
  2. Sneakerhead

    Sneakerhead Member

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    It depends on slope. If i go west to LA i get incredible mileage. When I drive east i get 290 driving under 75 consistently or 360 if going 80-85
     
  3. ZeApelido

    ZeApelido Member

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    Of course, I'm assuming flat road conditions.
     
  4. chronopc

    chronopc Active Member

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    I haven't tested it yet, but if it's under 300wh/mi that is really good.
     
  5. Haxster

    Haxster Member

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    For comparison, on my S, (without air suspension to lower the car), I get about the following results:

    MPH Wh/Mi
    50 230
    60 270
    70 320
    80 370
    90 440
    100 jail
     
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  6. Jedi2155

    Jedi2155 Model 3 has Arrived.

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    You'll have to report your configuration and tires too.
     
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  7. ZeApelido

    ZeApelido Member

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    Doh. LR model, 18" with aero caps.
     
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  8. Jedi2155

    Jedi2155 Model 3 has Arrived.

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    Thats in line with Troy's estimates (270 mile range at 80 mph ~ 290 Wh/mile)
     
  9. Kuro68k

    Kuro68k Member

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    That implies over 78kWh of energy from the battery. The battery is thought to be 75kWh and of course you can't use all of it.

    240 miles range at that speed seems more realistic (70kWh available).
     
  10. Jedi2155

    Jedi2155 Model 3 has Arrived.

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    EPA doc shows 80.5 KWh pack, 78270 Wh usable (beginning of life), 89404 Wh AC for a recharge.
    https://iaspub.epa.gov/otaqpub/display_file.jsp?docid=42148&flag=1

    Tesla likes to refer to a 50 kWh and 75 kWh, but honestly, they don't like using KWh as a metric either from what I understand.
     
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  11. SageBrush

    SageBrush 2018: Drain the Sewer

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    Correct. Usable is ~ 78 kWh
     
  12. SageBrush

    SageBrush 2018: Drain the Sewer

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    #12 SageBrush, Aug 31, 2018
    Last edited: Aug 31, 2018
    65 mph is ~ 220 Wh/mile

    A Model 3 traveling at sea level at 80 mph (36 meters/sec) has another
    150 N of Air drag,*
    = 41.6 Wh/km
    = 67 Wh/mile

    Added together, 287 Wh/mile.
    The useful point here is that once you have accurately measured the car on at one speed it is easy and accurate to model other normative highway speeds because the only Wh/mile variable to consider is Aero.


    *
    Air drag is 0.5 * Rho * Cd * A * v * v
    For the Model 3,
    Cd = 0.23
    A = 2.34
    0.5 * Rho (sea level) = 0.6125
    So Cd * A * 0.5 * Rho = 0.16482375
    So Aero drag is v*v*0.16482375 in Newtons, or ~ v*v / 6 (about 1% error)

    Work = Force * distance
    Newtons * meters = Joules
    Newtons/3.6 = Wh/km
    1 Km = 0.62 miles
     
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  13. daniel

    daniel Active Member

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    80 mph??? OMG! I think I'd be scared to drive any car at 80 mph long enough to figure out the efficiency. One of the things I love most about this car is that I can drive it let it drive itself at the speed limit and it takes away all the stress and anxiety. No need to drive it fast.
     
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  14. Jedi2155

    Jedi2155 Model 3 has Arrived.

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    80 MPH is pretty much traffic speed in some areas, while anything faster than 55 mph might feel crazy in other parts of the US. I was quite surprised by this when I traveled a bit around.
     
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  15. SageBrush

    SageBrush 2018: Drain the Sewer

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    The irony is when those high travel speeds are in congested areas. I suppose it is a psychological compensation of sorts: 80 mph once in a while, 20 mph the rest of the time.
     
  16. Electroman

    Electroman Active Member

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    I have hardly touched 80 in my life, may be inadvertently. 75 sometimes in lonely stretches, but mostly between 70 to 75.
     
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  17. Jedi2155

    Jedi2155 Model 3 has Arrived.

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    I fel
    That's odd because I was in Austin this past November driving 100 miles to a small town and I was commonly doing 70-80 and people were still passing me. In New Jersey, everyone was doing 45-60. Going between LA to SF or LA to Vegas, 80-100 is pretty common.
     
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  18. diamond.g

    diamond.g Active Member

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    How are you guys getting this data? I thought Powertools didn't work anymore.
     
  19. jamnmon66

    jamnmon66 Member

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    Just got back from a 4000 mi. road trip. I got around 280 at 80. Around 315 at 90.
     
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  20. Garlan Garner

    Garlan Garner Well-Known Member

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    I have a P3D+ Model 3.

    I go from 0 to 80 in 3.6 seconds...…..then regen back to 0......then 0 -80 in 3.6 seconds.....then regen back to 0.....all the way to work ( 49 miles). .

    Lets see...that might be an average of 40mph.


    I wonder what I would have to do to average 80mph? :cool:
     

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