Priuses do a power split where the engine drives the wheels and the motor-generators act sort of like an electrical CVT. You would have to be out of the power b

Priuses do a power split where the engine drives the wheels and the motor-generators act sort of like an electrical CVT. You would have to be out of the power band a lot to make a series hybrid more efficient than a parallel hybrid. The reason locomotives are series hybrids is just that mechanically switching that amount of power isn't practical. To my surprise, even off-highway mining trucks mostly use mechanical transmissions.