Well, using two different measuring "sticks," here is how much power I've seen used for 110v and 220v over the past few months (winter-spring-summer).
Going from empty (i.e., not running in EV mode) to full (i.e., charging cuts off), the maximum measured amount consumed on 110v (using a Ubiquity mFi to measure power) is ~8.3 kwh. The 110v charges were done using the stock portable charger that comes with the car. It pulls around 9A while charging and averages over 1 kwh per hour.
Similarly, on 220v, using a hardwired ChargePoint Home 25 32A, ChargePoint says the max consumed is 6.8 kwh. The ChargePoint app only reports plugged in time, not charging time so I don't have current draw or average kwh/hour info for that. Public ChargePoint 220v chargers run around 4 kwh/hour. In terms of total charging time, the max for 110v is 8:14 and 2:05 for 220v.
All that said, I don't fully trust either number. Testing the mFi with a light bulb leads me to think it overestimates power consumption. Given that a North American market E-tron will accept a max of 6.6 kwh, that means ChargePoint is close to 100% efficient converting AC to DC. Maybe I need more data to lock down both data sets.
For the sake of comparison, the GoM™ has displayed a high of 31 miles/50 km predicted range using both chargers. The GoM™ seems to give higher range numbers more often when charged on 220v vs 110v.
