I too have the same back seat not warming situation - will try the 3d printed extensions. Anyone figure out the defogging? I would agree with some others that this seems to be a weak point, at least with the 2024 Flash/heat pump models-
I've drug it down to 1% battery, then 0% battery on the way home from trips. It's become a little bit of a game and is a great way to learn the range and how driving habits impact it. As you can probably guess I haven't run out of range..... yet. Chances are high I'll "Kramer it" soon.....