That power-split device is genius. But, I'm a fan of the latest trend where you put enough batteries in to supply the power needed to completely propel the car

That power-split device is genius. But, I'm a fan of the latest trend where you put enough batteries in to supply the power needed to completely propel the car by electric motor. That way, the gas engine only runs a generator at low speed (series hybrid), then clutches in directly to the wheels to avoid conversion losses at freeway speed. You still have no "gears" (so it feels like driving a CVT), but the design is far simpler and even more efficient. The Mitsubishi PHEV does this, as well as the new Accord Plugin (I think).