Don't forget that as the temperature rises it's not only the AC but the BMS is keeping the battery cool too. Here in AZ it's been 110+ for a long while the temps certainly effects the efficiency and range. We just recently finished a road trip to OC, CA in our GGT and I averaged 2.5 or so...
I purchased the Anker SOLIX. Works great. Used it as both a freezer and fridge on separate occasions. Held the temp very well. A bit heavy but two people can handle it when it's full.
I traded my '22GT with 37K miles to Lucid in December. They valued it at $44K which was $2-4K more than Carvana or any other place I shopped it. There is a 2K loyalty credit currently available.