Energy Monitor OCD

My long daily commute gives me plenty of time to over-think things such as what the energy monitor display is trying to tell me. It's an over-simplified representation of the car, in that it only shows one electric motor and doesn't include the AC or accessories. Here's some of my more detailed observations:

1) It seems the electric motor shown on the display is MG2, and MG1 is part of the ICE. This is the only way to explain that on rare occasions it will only show arrows from the ICE to the wheels. Obviously, without counter torque from MG1, the ICE can't provide any propulsion.

2) When in heretical mode, only red arrows appear on the left side of the motor. Again, this only makes sense if MG1 is included as part of the ICE. When the battery is contributing energy, green arrows will appear from the motor to the wheels and it's not possible to tell if heretical mode is active.

3) In normal mode, the energy monitor will show divergent green arrows from the motor, one to the battery and the other to the wheels. When climbing a hill in heretical mode, stepping harder on the gas will make the ICE audibly rev and then the green arrows to the left of the motor appear. Easing off lowers the ICE revs and only the red arrows remain to the left of the motor. This is a very imprecise way of guessing the approximate ICE RPM.

4) AC and the entire 12-volt system are lumped in with the battery. And since the arrows only show direction, not magnitude, it's quite possible that only a trickle of energy is going to the "battery" when accessory loads are high. This might explain why sometimes the battery loses a bar while charging, and why more time is spent charging than discharging while the ICE is operating. Sometimes "charging" is really just keeping the accessories operating.

Not sure I have a point to all this. I'm surprised at the situations in which the display is showing the battery charging. There's a rather significant hill on the Merrit Parkway that some of the lesser cars made during the 80s could not maintain 60 mph on. I drove my Prius up that hill recently, and while the engine was screaming it did manage to gain a few mph up the hill and showed the battery charging most of the way.

If I can put this much effort into analyzing the energy monitor, it's probably best to keep me away from scan gauges.