http://www.greencarcongress.com/2006/08/pmls_inwheel_mo.html

80 mpg with a standard internal combustion generator.  And 2 hours driving on batteries before you need to use it.

With a solid oxide fuel cell of the new CeO2 variety coupled to a microturbine this car could get 400 mpg on any liquid fuel.  Destruction of Earth's climate as we know it could be stopped with this technology.