http://www1.eere.energy.gov/vehiclesand ... 2012_p.pdf" onclick="window.open(this.href);return false;
http://www1.eere.energy.gov/vehiclesand ... 2012_o.pdf" onclick="window.open(this.href);return false;
From the 2nd one comes this great slide showing system efficiency:

Energy from the wall from dead to 100%: 25.414 kWh
Energy from the onboard charger to battery: 22.031 kWh
Energy from the battery during discharge: 21.381 kWh
Good stuff!