In article ,
says...

"Tim Wescott" wrote in message
...

While I haven't seen power budgets, if an electric car manages to take
80% of the energy that came in on the charging plug and turns it into
forward motion, I'd be surprised.


http://avt.inel.gov/pdf/fsev/costs.pdf

That's dollar cost and has little to do with the actual energy consumed.
Remember that much of the cost of a gallon of gasoline is taxes. Those
same taxes are not currently applied to electric vehicles, but if they
become popular those taxes will be.