I discarded that because its irrelevant, this thread is about E-M charts, corner speed and best sustained turn speed for your own aircraft.
Lets see, the OP says -
"your best speed to maintain if a turn fight is what you are in." I think maybe theres some interest in HOW this info affects FIGHTING the airplane ...
And you discard
"getting KILLED" as irrelevant ... Hmmmm ...
I guess anyone WANTING to get killed should probably pay attention to you ...