alternate route
I drove from mass to SD in 4 days (one driver... me) a few months ago. I took I81S, then I40W all the way to arizona before cutting down to... I8? No, there isn't a lot to see, but the drive from pennsylvania until maybe oklahoma is pretty nice. new mexico is pretty as well. I40 runs along route 66 for a bunch of the way, too, so it would be easy to do a little bit of sightseeing down that way.
I think this way is actually faster than yours, despite what it looks like on the map.
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