Last week I drove for the day with a friend to our summer place to install a 14-50 on a 50A breaker in the garage. Trip is about 165 miles each way from South of Portland to near Sunriver, over Santiam Pass (4800 ft). Since we were returning the same day, we stopped at the Bend Supercharger, my first 'real' Supercharge i.e. necessary in order to get home. Normally I charge at 29 mph on 50A circuit at home using a 6-50 welder socket.
The Bend SC is in the Fred Meyer parking lot. We pulled in with about 75 miles and picked up 110 miles in 13 minutes. There were 3 other cars there, so we got the last unoccupied pair. We sat in the car with the A/C because it was hot and we wanted to watch the nav planning. The best part was the real time updates on the nav plan back to home. When we started it showed a stop at the Detroit Lake Supercharger, then, after a bit, that was removed from the plan. I just sat and waited for the destination to get a bit over 20% and then unplugged and left.
We left the SC with about 185 miles for a 150 mile trip. That would normally not be enough for me, but the trip includes about 3500 feet of altitude loss = extra miles. The planner projected about 21% arrival and we were at about 19% when we arrived (extra fun enroute).