Yup, you got pretty much the same info as me. I'm still tinkering with the return trip. I don't mind doing the 500mi days, trying to stay under 550 as a max and I think my longest trip is 527ish.

Thanks for the info on CA 4, I'll definitely take that!

I'm going to fill my tank in Vegas on the way out of the city and planned on taking your suggested route through NV 318. I'll fill my tank in Ely then in Wells too.

If I do turn out to be too exhausted or the day is a lot longer than expected, I will definitely see Shoshone on the way out of Twin Falls. Same thing with Lake Easton. For my return trip those stops are more like estimates at this point. They are the furthest I'm willing to drive, if I'm too tired before I get to those points I will just stop at the first place I see along the way. For the second night I predicted my overnight to be anywhere around that Yakima/ Ellensburg area but could end up being anywhere from Pendleton depending on how I feel at the time. My ideal return trip would be the one I laid out as it would get me home at roughly midday on the last day of travel which still gives me most of a day to unwind and relax and catch up at home.

Luckily for us we still have 8 weeks left to get all the details ironed out haha