I think there is about 4kWhr at the bottom as a buffer. The GT's are supposed to have a 112kWhr battery. The unofficial API for my car shows battery health at 93.6% and battery capacity of 101kWhr. The math works out to 108kWhr. In addition, Lucid told Tom Moloughney after his recent range test that he could have gone another 15 to 16 miles after the car showed zero. That also works out to about 4kWhr.