Even more remarkable, its generator was powered by a highly-efficient Stirling external-combustion engine. It is worth noting, however, that this isn't a "hybr

Even more remarkable, its generator was powered by a highly-efficient Stirling external-combustion engine. It is worth noting, however, that this isn't a "hybrid" in the same way as the Prius or Insight. The drive train is much simpler and only connects the electric motor to the wheels.