One of my gripes about news features on new electric cars is that they
frequently give the milage per full charge, but not the energy content
per charge.  So it is impossible to do a cost comparison with a
gasoline or Diesel car.  We need to know how many kilowatt hours (or
Joules) per charge. If I know my electric rate (it appears each month
on my electric bill) I can see how much a full charge costs me. I know
what I pay for fuel (or play "what if" games) so can compare with a
high gas milage gasoline car.  But without knowing how much
electricity a full charge represents, it is impossible to do the
comparison.