I have long watched tesla and proud of you reviving the EV1 concept and taking it to new heights. Battery is still the limiting factor for Tesla. Have you considered a small range extender, possibly that also capitalizes on renewable sources and technologies as an add on? Here is my thought: Tesla is complete by itself. In the "frunk" is a small space where you can possibly place an add on. If there is a smaller version of http://www.bloomenergy.com/
(which is another california start-up technology) "bloom box" which can actually kick-in when batteries are running low.