I know that there is no physical energy depletion recorded against on your team when playing friendlies but what about starting energy? I've heard it said that you automatically start at 100% energy, but experience doesn't seem to play that out in my opinion. I assume you start at the energy your team is at (and not 100%) and the game simulates a match from there with the ensuing tiredness that comes on as the game progresses. Is this correct? In other words your team plays a better friendly match against the same opponent if your team is at 100% energy at kick off than say 60% energy?
Energy % and friendlies
Your assumption is correct