TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

True Driving Range

Discussion in 'Model S: Driving Dynamics' started by chucks, Nov 24, 2015.

  1. chucks

    chucks Member

    Joined:
    Oct 23, 2015
    Messages:
    5
    Location:
    Escondido, CA
    As with an ICE car, a Tesla's driving range is a function of many things, including speed. On a recent 8-day trip, my first long range trip in my S, I noticed that the predicted driving range did not match what my odometer displayed as I drove. On a flat highway using cruise control to maintain a steady 80mph, I computed that I was achieving about 80% of the predicted range. Has anyone taken samples at other constant speeds?
     
  2. Max*

    Max* Autopilot != Autonomous

    Joined:
    Apr 8, 2015
    Messages:
    4,887
    Location:
    NoVa
    80mph is much higher than what Tesla used for EPA testing. Just like at 80mph you will never get your rated MPG in an ICE.

    Tesla has a calculator online, I think it's right on the main page

    - - - Updated - - -

    Model S | Tesla Motors

    Most of the way down, you'll find it "range per charge"
     
  3. Roadrunner13

    Roadrunner13 Member

    Joined:
    Oct 16, 2013
    Messages:
    292
    Location:
    Montreal
    Maintaining a steady 60/65 mph will get you closer to the predicted range in 'normal' driving conditions...
     
  4. JohnQ

    JohnQ Active Member

    Joined:
    Jan 1, 2012
    Messages:
    1,585
    Location:
    Redding, CT
    Sampling at a variety of speeds is tough due to the large number of variables. You'd have to hold wind, air temperature, humidity, road surface, battery temperature, tire pressure, and many more constant and do so over a sufficiently large distance to get statistically significant results. It can be done, of course, just not how I would want to spend a few days. As mentioned above, Tesla published a few samples on their site.
     
  5. Lyon

    Lyon 2016 S P100DL, 2016 X P90D

    Joined:
    Dec 26, 2011
    Messages:
    1,990
    Location:
    Eugene, Oregon
    If you're getting 80% that's probably pretty good for 80mph given that drag increases dramatically over about 60mph.
     
  6. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,065
    Location:
    Brea, Orange County
    80 mph needs more energy than 70 mph, but going at 60 mph uses even less energy to travel the same distance. The official numbers are always on the optimistic side. You have to drive very 'gentle' to be able to get the rated miles.

    Once you had your car for a while you'll get a good idea how far it goes in reality depending on weather. Don't use Tesla's range calculator on their website. It's not realistic. It says my 85 would go 280 miles at 65 mph in warm weather. Not going to happen. :)
     
  7. mkjayakumar

    mkjayakumar Active Member

    Joined:
    Aug 18, 2012
    Messages:
    1,743
    Location:
    Plano, TX
    I had a chuckle when I read that OP couldn't get rated range at 80mph, especially when there is qualifier that he is aware that speed impacts range. Perhaps he should try 100mph to get the rated range?

    Every mile increase in speed roughly increases the energy needed quadratically to cover the same distance. So if you use 10kwh to cover 5 miles at 50mph, so you will end up using 20kwh to cover the same distance (5 miles) at 100mph most of it due to wind resistance and to a lesser extent due to rolling resistance. The effect is pronounced at higher speeds and less at lower speeds.
     
  8. techmaven

    techmaven Active Member

    Joined:
    Feb 27, 2013
    Messages:
    2,583
    Well, this confusion stems from the part where Tesla uses rated range to express remaining battery capacity. That's not the remaining range using your current driving conditions. You have to use the energy graph to get projected range information, but since it varies a lot depending on your driving, you have to play with the settings to get a good estimate. If your navigation is set up, you can also use the trip information to see how far you are deviating from the range estimates.

    For reference, see:
    Model S Efficiency and Range | Tesla Motors
     
  9. Khatsalano

    Khatsalano Member

    Joined:
    Mar 21, 2015
    Messages:
    648
    Location:
    San Mateo, CA
    http://www.evtriplanner.com and look at Rated Miles (RM) to see how the variables affect your effective range. Or, if that's too technical, the Tesla website does have the pretty cartoon version of it per above. :)

    - K
     
  10. musicious

    musicious Member

    Joined:
    Apr 11, 2015
    Messages:
    223
    Location:
    Wheeling, IL
    I may be oversimplifying it but I got tired of the rated range being so optomistic so I changed my display to show % battery and then predict mileage as a little over twice battery % to be conservative. So at 90% battery instead of the rated 240mi range I assume its more like 180 + a little more or around 200mi.
     
  11. davidc18

    davidc18 Member

    Joined:
    Apr 25, 2015
    Messages:
    815
    Location:
    So. FL
    Given that the car has your driving history, it should be trivial to compute and show you your "likely" range at any given moment. Tesla has made a decision to not provide this information to us.
     
  12. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,766
    Location:
    Texas
    And here I thought it was hard to get less than rated range :)
     
  13. tstafford

    tstafford Member

    Joined:
    Jul 4, 2015
    Messages:
    790
    Location:
    Nashville, TN
    That's pretty clever actually and off the top of my head probably about what I get too. Judging from your numbers you are a spirited driver ;).
     
  14. musicious

    musicious Member

    Joined:
    Apr 11, 2015
    Messages:
    223
    Location:
    Wheeling, IL
    Thanks I figure it helps to plan a trip cause if the miles are within twice the battery % then I know I have enough to get there.. I was being conservative tho I do like using climate and acceleration :) In the winter temp I figure I just wont add the extra so like 90% =180mi range
     

Share This Page