It seems that the charger moves the state of charge around sometimes I will get 1 or 2 green bars even when the battery is almost at full charge. Then other times with 5 or 6 bars under the same load it will not show any green bars. I have one spot on my way to work thats fairly level and I can go 1 mile at 40mph with 4 bars of assist and 100mpg until I get down to 4bars of battery then I will get a forced regen. By using full IMA you do not seem to gain overall mpg. There must be overall losses in converting ICE energy into battery and then IMA energy. So I usually only go electric only mode when I have a 6 or more bars on the battery. This is a fun car to drive.