3 ms·

It is not naively optimistic. I just finished a 2500 mile drive with a Tesla Y and its estimates are pretty much within 1-2% of my actual usage.

• HWR_14 3y ago
  As the article (or another poster) points out, you get a different algorithm when you look at the dash on a random day vs. when the Tesla knows you are going on a trip. That's even more damning to me. Edit: Also a different algorithm when below 50% charged. As some of the replies point out, a destination does supply more information. The current charge level does not.
  • tekla 3y ago
    How does the Tesla know I'm going on a trip? Are you implying its strange that the Tesla can calculate a more accurate range estimate when you literally tell it where you want to go to its computer which can use map data to calculate energy usage, versus you just driving around in circles in a arbitrary area and the computer only can assume based on EPA average usage?
    • rootusrootus 3y ago
      It doesn’t use average usage to calculate the remaining range, it uses EPA numbers which are 200 Wh/mi or less. Which, interestingly, is less than the consumption shown on the Monroney sticker. How they can show two contradictory numbers on the same official document is fascinating to me.
      • tekla 3y ago
        I meant EPA average usage
    • cowsandmilk 3y ago
      > computer only can assume based on average usage It is clear from the discussion that it isn’t basing it on that at all. Would be overjoyed if it was based on average efficiency for the last 50 miles I drove. It isn’t.
      • tekla 3y ago
        I meant EPA average usage. And good it shouldn't.
        • mlyle 3y ago
          Very few people attain EPA average efficiency, so insisting on putting a range indicator based on EPA averages seems silly. Most ICE cars calculate range based on a long term average of a person's usage with some small amount of pessimism. Why should an EV do worse?
  • gt565k 3y ago
    When going on a road trip Tesla calculates the time based on the route you put into navigation. Obviously it will give a different estimate than stop and go traffic and starting the vehicle without pre-conditioning the battery. Tesla does a great job with their scheduling functionality that lets you pre-condition battery before you leave and even when you near a supercharger to maximize charging efficiency of the battery.
    • HWR_14 3y ago
      That makes sense. But if Tesla is going to do that, surely their less informed estimation shouldn't be so naive and use historic data. Why would Tesla guess I'm in stop and go traffic when it knows I spend 80% of my time on a highway. Shouldn't it aim for either the most accurate or most conservative naive number? As the article points out, it also switches to a significantly more accurate estimation once the battery is half discharged.
  • mensetmanusman 3y ago
    That’s how it’s supposed to work. EVs, to a fault (some may argue), are so efficient that any change in driving condition can have a major impact on range. Eg. Having a window down, slope, number of passengers, etc.
  • aaomidi 3y ago
    They’ve never hidden that the range displayed on the screen is assuming the EPA estimate for the car? The actual range depends on what the route is going to look like, and adjusts based on how much your usage so far has been. Like, this is painfully clear to the drivers of this car vs what this article is suggesting.