I did a full EV drain of my 2013 Energi in July and got 5.1 kWh.
It has been a lease for the first 4 years of it's life (81k miles) and I don't think it was hardly plugged in.
In the last 20 months of my ownership I've put on about 2,400 kWh and ~9,200 true EV miles. No apparent degregation. I have an indoor/outdoor thermometer I keep in the back luggage space. The outdoor thermometer cable is snaked underneath the removable battery cover and shoved down one of the holes, to get as accurate feel as possible for battery temp. If >95 deg F, I try not to charge.