I've posted this before...
http://www.acpropulsion.com/tzero_pa..._html_home.htm
Get rid of teh PbH2SO4 batteries and replace with Li-ion technology that has twice or more capacity for the same weight...
I'd buy one... And did I mention it recharges in about an hour... Hmm. sounds like enough time to go grocery shopping...
And this car has been around for 5+ years I think. Imagine what could be done with modern composites...