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ICE charging is not as efficient. It is physics topic indeed. Energy is generated by burning fuel in ICE, then used to spin the CISG motor to generate electricity to charge battery. Later on road, battery is used to power the rear motor. But battery could never output the same amount of charged energy because it consumes some portion. CISG and rear motor also waste some energy for sure. Overall maybe only 70% (for example) of ICE energy is delivered to the wheel. If ICE drives wheel directly, maybe this number is 85%.

Similarly, B mode or aggressive regeneration or single pedal driving is not as efficient because you spent more than adequate energy and recapture only some part of it by regenerative braking, and then some of the regenerated energy is consumed within battery and motor. The best way for efficiency is to keep constant speed as long as you could.

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So the B mode is useless or at least not very beneficial? I've never used the engine charges hybrid battery option but it seems like that is worthwhile at times. Sorry I'm really lost with this and the B option. I honestly just stay in Hybrid or Pure mode 95% of the time.
 
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