There is a difference between turning off the kill switch and the ignition switch. If the engine is switched off with the kill switch, then the data of the sensors (MAP sensor) are stored as it is in the situation of switching off.
When the engine is switched off via the ignition switch, the sensor data are reset and on restart the ECU goes through the normal starting process. In cases where ambient conditions such as air pressure and temperature have changed between shutdown and restart, this can be of importance to the ECU. Just my experience….
Regards, Georg