The question is if it is illegal.
I agree that reporting a maximum possible range is meaningless and might be misleading. But it is still a truthful metric making it a quite dubious legal claim.
>other EV tries to give a realistic range based on the temperate and your driving habits.
What I saw was specifying the test conditions under which the range was achieved and including disclaimers about possible factors which can reduce the range. Certainly more honest.
I leave my car showing battery as % all the time, because the % * epa range number is meaningless
Take a look for yourself. EPA range vs a "real world" test is all over the place depending on vendor, and even depending on the car. Rivian, Kia, Nissan all have ranges that are under by similar percentages as Tesla. Only Porsche seems to heavily sandbag here.
E.g., suppose the EPA range is 300 miles, you started from with a full charge, are 100 miles into your trip, and are at 1/2 charge. If what others have said is correct by default Tesla will estimate you have another 150 miles of range left (EPA range of 300 x 1/2 charge), whereas many others would say you have 100 miles of range left (you went 100 miles so far on 50% charge so if nothing changes the remaining 50% should give another 100).
If you look at the state of charge % (and use the miles setting, instead of %), then sure. It'll be optimistic unless you drive the standard EPA route.
Honestly though, because battery drain is so dependent on route, elevation traveled, temperature, etc, I find the 'guess-o-meter' estimates to be mostly useless. You'll frequently find other vehicles that will start optimistic and degrade over time as well.
What's your source? Cause I don't think that's true... [1][2]
Here's InsideEV's comparison to EPA range where Tesla is a huge outlier:
https://insideevs.com/news/679024/recurrent-tesla-range-lowe...
Teslas appear to always show the EPA range at full and it sounds like they stay very optimistic for quite a long time, giving drivers a very unrealistic picture.
That’s lying to the customer. They’re not trying to be useful but to look good.
And in every EV range comparison I’ve ever seen, teslas are the ones that can’t meet their claimed range by a fair margin. Other brands are almost always close to accurate or in some cases do noticeably better than claimed.
Only Tesla does this.