I have done the testing to verify the Drains.
On initial test, 2.4 amps is right in the range before Sleep Mode.
Once Sleep Mode is entered, drain dropped to 50 ma. or .0050 amp. on a stepped basis after about 45 minutes with Hood closed and Doors locked.
The PCM sees everything over all the Busses until they are a clear condition meeting Sleep mode level.
Some Modules and functions must stay alive full time such as Remote start, Theft, fuel tank pressure monitoring etc.
There are some 30 separate Modules that are involved depending on the vehicle build and features.
They all may have different times to go into low drain mode.
Good luck.