I had my GOM range down to 11 miles with the last bar flashing yellowish/orange for the first time by forgetting to plug in several times this week.
When I got home I used Torque pro to read the individual cell voltages and they were at 3.50 volts and it was showing 10% battery charge left.
With the cells at 3.50 Volts the discharge is at about 95%. So the upper and lower end buffer on what is usable in the battery is only about 3% on both ends from my measurements. These voltages are the same as our Gen 2 Volt.
I wanted to add that when my car got low enough to ask if I wanted to turn the radio off that it did not cool the battery even though it was hot outside and has been cooling when properly charged every day.