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Leavenworth, WA to Centralia SC

I haven’t done it, but if EV Trip Planner says so, you should be good to go! IIRC there is an elevation drop which should help, also, you can *always* just drive a bit slower, and you’ll still save time over going through Ellensburg that’s for sure.
 
I did that route in 2012 in my Leaf (not all in one charge, but there are Chademo's every 50 mi). I was full in Leavenworth and had 9 mi on the Guess-o-meter with half a battery (out of 24 KWh) at the top of the Pass. I then coasted down to Skykomish and had ~40 mi on the GOM. You will be fine. Remember it's a 2-lane mountain pass and not a freeway, so speeds over 40 mph will be difficult at times.