7% isn't range anxiety!
Sounds like you did a pretty good job overall. Keep in mind you benefited greatly from losing elevation, and you might have benefited from a tail wind. Had this been in the other direction, you probably wouldn't have made it, or at least wouldn't have made it driving the same speed.
Might not be easy on those non-interstate roads, but I wonder if you could have drafted any semis. I found that drafting at 65mph used less energy than driving 55mph without drafting. And driving faster feels enormously better on one of those legs lol.
I did take the 2,000 drop in elevation into consideration before deciding to go for it. Wasn’t much of any wind in either direction, so I don’t think that played a factor. I could have drafted behind a semi truck at the risk of glass damage / not seeing a pot hole and getting a blow out. The roads are not the best on a lot of these stretches. I figured if I ran out of battery I could always get a tow into midland and it wouldn’t have been the end of the world. But I made it and I’ll never do that drive again if I can avoid it! Haha!