I'll reply to the above:
1-I don't have the NAV display so I am relying on the display in the speedometer section. The engine came back on when the display showed about 2 bars left. The gas engine didn't try to come back on before that and I resisted trying to get another bit out of it by slowing down.

2-4.9 minutes seems long when you are going 50kmh on a country road. Remember that I was driving at a steady speed the whole time. No pulse and glide, no coaxing. I have gotten much longer times when sitting in heavy trafffic and moving only a bit at a time but that is too difficult to compare as you are only running the radio and the clime. The car will run about 20 min in that situation.

3- The display was on full when I started but I slowed through an intersection to start so it was in EV mode a few meters before I zeroed my km display. The non-Nav display may not be as clear to read but It looks like I had the equivalent of 2 levels left. It always comes back on at that level.

I tried something else a bit later. I live on the side of a mountain and the driveway in my complex is very steep and long. At one point it levels out and I usually go into EV mode due to the slow speed I am at. Then the steep hill starts again at a sharp curve. I had noticed that the car would stay in EV up the steep curve a ways so I decided to try to get it to stay in EV all the way up. By slowing down to 10kmh I was able to drive in EV all the way up. I drove about 300m. I was amazed that the car would stay in EV on such a steep hill. I can't get up this hill in the winter without chains and 4x4s have difficulty. Not very scientific but interesting.