There are way more ways to make a car or vehicle more efficient than to shoe horn the drive train froma prius into it.
Have you vsited 99mpg car? Mike has done quite a few things over the years to get more mpg from his insight. He added a phev kit. He added a 5th wheel that was powered by 4 deep cycle batteries just to name a few. He even made a way to manually control the ima system.
