Concerning adding range extenders to an EV --- GM did that with the early Chevy Volts, The EV was re-charged by a non driveline connected ICE engine. In effect the Volt had substantial range. GM discontinued the Volt because of cost added by the ICE range extender. This extender was not connected to the drive wheels - it was simply a basic generator.
Like the women I have dated --- Always looking for a better deal ....
