Myself and Dax have proven that to get more mpg and performance out of a hybrid you jsut need to back feed the battery pack to the hybrid system. Why reinvent the wheel when you can just add MORE POWER?????
Lets say you go the die-sel route. Are you going to use the power splitter or supply your own tranny? Since its an E-CVT you need the synergy drive system for it to work properly unless you use a cvt from a Honda or some other vehicle.