There are a couple of us in my family with some experience with diesel-electric motive systems. It occurs to me that with today's perfectly acceptable constant-velocity transmissions, this is a solution begging for prototyping.

A constant velocity diesel -- using the cleaner fuel now available [or bio-diesel] -- generating electricity to drive motor[s] -- and providing appropriate torque via a CVT should be an efficient solution to energy/environmental problems in personal transportation.

Sorry for the long sentences. 2 extra cups of coffee, this morning.