This. Just did this last week. I didn't quite believe the trip planner when it told me I need x+y miles worth of charge when Lowell was only x miles from the LR SuC, and almost didn't make it as I didn't do what it directed. I did stop at the Clarksville Walmart on my way back. I made a scene - bunch of kids and adults walked up stating they had never seen Tesla before.
It was a tight run from Lowell to Little Rock in our car, but that's expected, given the distance between them.
I could probably have charged to 90% and made it with 7 to 8%. Not bad really for 209 miles at Freeway speeds in light rain.
(Charged to 100% and arrived with 18)