[Kirby64]

https://insideevs.com/reviews/443791/ev-range-test-results/

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.

[tzs]

I think what the person above you is talking about is not EPA range vs "real world" range. It is "car's estimate of remaining range before you have to recharge" and " real world remaining range before you have to recharge".

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).

[Kirby64]

If you use the navigation, or use the Energy app on the car, then both of those will appropriately tell you your expected remaining range and the arrival state of charge. It does this quite well.

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.