I made it up this past week and charged at the Stevens Pass Chargepoint chargers. They worked well. It was a journey though. Drove to Duvall, charged at the fire station charger (I think this is the closest charger to the pass) for 1:45 until it was full again, then went 35-55mph until Skykomish where it starts to get steep. Went 35-40 mph up the steep portion to the pass. Arrived with sweaty palms, one bar and one mile left on the guessometer. I suspect that it could have gone further though (the estimated range dropped quickly over the last few miles). Never went into turtle mode. Also of note, I was the only person in the car (plus skis and a snowboard).
I charged from 10AM to 4PM while I went skiing and returned to a fully charged car. An interesting note... you don't really need to recharge fully at the top. I did and the car refused to regenerate during the first 10 miles of descent as the batteries were completely full. I didn't want to risk it though as I had 80 miles of mostly freeway driving ahead of me in order to get home. Made it home with "15 miles" of range left.
It can be done but it's risky... If you want to try it definitely bring your cell. Also, do it during hours when there is no rush up to Stevens Pass. I pulled over to stop and let people pass about 4-5 times (wasting energy getting going again). Other than those stops and the fact that I was going about 50mph over the flat portions of the drive, I don't think there was much more that I could have done to be more efficient.
...this was all in eco mode without climate control. Good luck if you want to try it!!
