I do not have the information, but I would like to know the true efficiency of electric cars.

Lets just say the power is generated by a gas turbine power plant, it then has to be carried long distance, then stepped down to a level that can be handled locally, then distributed, then turned into DC power to charge the batteries, and then the batteries finally can turn it into mechanical energy.
I am guessing that there is a significant loss of energy in the process to turn natural gas into mechanical energy in an electric motor.