2018 CT6 2.0E plug-in with 30K miles. The +50 miles on battery(usually 43-45 miles) is not the norm. This was a result of 41 mph average according to myGM app and no HVAC on. Still on snow tires but at 42 psi. I purchased it with 575 miles in 2020 and only once seen 13.5kw usage.
I'm currently trying to only charge at 8-amps to see if some low levels cells can be brought back up.