DaveinOlyWA wrote:based on a 19.2 kwh pack and my estimated 106 mile range which would imply a mpk from pack to wheels of 5.52 mpk
I believe that is a misconception. It seems to be pretty well established that the total usable
capacity of the battery is about 24 kWh, although that does work out to about 19.2 kWh for 80%, or, if you prefer, from 10% to 90%. But you don't charge between 10% and 90% of usable
capacity. The 106 mile estimate is from wherever you are (presumably 100%) down to 0%. It is how far the computer thinks you may be able to go if you run the car down past the Low Battery warnings, down past the heat/AC power limitation, down past the turtle mode, until it finally comes to a stop. i.e. it is how far you can go on 24 kWh, not 19.2 kWh.
Using that basis, the computer is saying that battery to wheels will be 4.42 mpk. You got 3.28 mpk wall to wheels, which is only about 75% efficiency. Still very bad, though not as bad as you thought. However, you shouldn't assume this is all charging system inefficiency. Some of it is probably due to incorrect estimation in the computer program that is trying to guess how well you will drive before you start your day's trip. Also, with temps in the mid 40s weren't you using the heater? Surely that 106 mile range was their estimate with climate control off.