If that was me, I'm guessing that I drove maybe a mile after the supercharging and before that, it was driving into Philly and in it to get to the hotel.
Did you navigate to the supercharger and precondition during traffic?
That would lead to very high Wh/mi values. It is something like 7kW of warming (could be a little off, cannot remember if it is even as high as 10kW). So if you averaged 5mph during those few miles you’d get 7kW/5mph = 1400Wh/mi. And it could come down from that a bit for a couple miles if you were traveling closer to 15-20mph.
Which is kind of what you see and the mileage lines up.
The question is whether your car was “whining” and how much warming it wanted to do…you had been driving beforehand so less heating was needed, but it requires a lot of heat to Supercharge.
From your OP, it’s not clear exactly how much driving you did on Saturday prior to Supercharging, or whether you drove just the mile to the Supercharger, or whether you did additional driving before hitting the Supercharger.
In any case, 900Wh/mi for 10mi is only 9kWh, and obviously substantially less than that was used. 9kWh is 18% at most for an RWD/SR+, and less than that for an AWD, so that doesn’t explain 25% loss very easily. Obviously the car could have been driven a lot longer, of course. But just a few mile spin by the valet does not explain it.
I can’t really explain the 25% loss unless the door was left open with the phone in the car and did not turn off automatically (it usually eventually does but maybe there are some escape cases) or somehow climate was turned on remotely or manually selected to be left on. Sentry alone would not explain it on this timescale - what was the exact time period the car was left for?
What vehicle model do you have?