@sendler, That paper only deals with dc consumption (towards the bottom), and refers to another paper for AC charging efficiency, which references the vehicle state of charge and station kw readings (if available)...
http://avt.inel.gov/pdf/uev/eva/etautp8r0.pdf
I think accurate tracking it is a valid concern, but it is still early in the game for EV's. The slant seems to be on usibility (manufacturer must provide a charger with 12 hour max recharge time) currently, but nothing about making more detailed efficiency measurements available.