More info on the CMT-380:
Update on the CMT-380 microturbine hybrid sports car — Autoblog Green
Interesting tidbit about how much the turbine price could come down.
Capstone Turbine Corporation | Press Releases | Photo Release -- Hybrid Electric Supercar With Microturbine Technology to Debut at LA Auto Show
"The Capstone C30 microturbine is so clean it does not require any exhaust after treatment to meet stringent clean air requirements of the California Air Resources Board or EPA 2010." -Cool!
Of course I would be much more interested in a 100mpg smaller car than a supercar, but I'm sure it will make the transition if it can be cost-effective.