GM has stated that their intent is to create a global car that has full performance under all reasonable driving conditions. They have spoken about starting the genset at 30% but have shown the battery will be allowed to discharge below this point when exrra power is needed. The car must still be able to perform even when starting a long inclining drive at 30% SOC. While the full power of the traction (driving) motor may be utilized for hard accelerations. These are only short term loads that require high power but not a lot of energy. The battery can easily supply the full power needs even when at 30% SOC and a bit below that.