google map is non stop driving. I went from central pa to vegas & I had 2 overnights, rolling down 15 into vegas at dusk on the 3rd day. When it got dark I just found a motel for the night & hit the road at 7 am. Route 80 to Denver & then 70. I can tell you this, there is absolutely nothing to see from pa to Denver, Rockies are just beautiful as is Utah. Must see is Bryce canyon & Death valley. was going to do Golden gate bridge, but a death in the family forced an early retreat. Came home 40 & 66. Spent two weeks dicking around various national parks, hoover dam & such. Only stayed in Vegas because it was central to the things we wanted to do & was cheap lodging & food. I'd like to do it again & stay north to Washington. I'd really like to do it in the 63, but the 12 mpg will probably be a deal breaker. I rented a car from enterprise & it was nice not to have to worry about breaking down or smoking wildlife with my own vehicle.
Just do it.