I dunno what to tell you. It did it. A disengagement every 40 miles is not what I’m seeing on my car.
(By the way, this is part of the reason Tesla owners get called Elon-worshipers: we see the sentiment in places like this, it doesn’t line up with the reality we’re seeing every day, and trying to correct the discrepancy comes across as worship. It’s not, it’s just that it seems like something other than truth is driving these conversations.)
How did it even go 400 miles in the first place without stopping to supercharge?
I have a Tesla. My second so far, and I've been driving one since the first Model 3 was released. Pretty happy with the car. FSD is cool, better than I expected in many way, but I just can't envision it going anywhere over single-digit miles without a disengagement. I never got more than 3 or 4 miles before it did something requiring me to take over. And it was worse on the highway, not better.
Not interested in a fight, but I remain very skeptical every time someone makes a wild claim of hundreds of miles continously on FSD. It just doesn't match my experience at all, nor any of my friends who also drive Teslas and have experienced FSD.
400 miles is at least 5 hours of driving, which is a bit long for not even having a pee break. Since you're driving a BEV, it's also above the maximum range of your car, so you had to have stopped at some point, which suggests that there are details in your claim that are already missing because (you feel) those details don't matter to the essential truth of your statement.
I believe that you believe you made a 400-mile drive with full self-driving without any issues. But I also believe that belief can be made in good faith even if there were issues during that drive--either the things that did come up you don't mentally classify as issues, or you've just failed to commit what did happen to memory.
That's not a knock on you, by the way; recently, I've been struck in a number of instances the times where I have physical proof something happened yet I have absolutely no memory whatsoever of it happening while feeling that I would have had to have that memory. Human memory is notoriously finicky and fallible.
(By the way, this is part of the reason Tesla owners get called Elon-worshipers: we see the sentiment in places like this, it doesn’t line up with the reality we’re seeing every day, and trying to correct the discrepancy comes across as worship. It’s not, it’s just that it seems like something other than truth is driving these conversations.)