it turns out that it does indeed stop charging 2-3 bars before full... But unplugging and plugging it back again, it charges another 3-4 hours all the way to the end. Weird, right?!
Yesterday, before trying this full-charge event, I drove it until and past the turtle mode. I left it in Drive with the handbrake on, to let the pack drain to the bare minimum. The creeping effect did the trick in about 50 minutes with the car fully stopped.
The range of the car is still quite good, about 62miles/100km, with a lot of stop-n'-go traffic and some good hills in-between...
I'll be flying to Austin mid Jully and the OBD link is on my shopping list, as well as a eMotorWerk JuiceBox Pro 40A, to better track the charge events (sure, I'll be limited to the i-MiEV's 3,6kW)....
Later today I drove to the nearest CHAdeMO, 70km away, averaging 80km/h... I arrived there with 35% left (according to the ABB charger) and ± 5 bars on the battery indicator. Pretty good! But... Instead of charging all the way from 35% to 80% as displayed, it stoped at 72%, once the estimated time was over (22min). I did restart the charger but the car stoped it at 74%... I restarted it back again, and this time it went to 80%, and so I manually stoped it. I should also mention that I did arrive there after a monstrous hill and the day was really hot, ± 100˚F! Drove all the way back home, 70km, and I still had 18km left out of the 80% charge. So it does look that it still got 100-110km range left.
BTW, coasting in N is indeed a good advice, incredible how good it glides downhills...