In article ,
Dave S wrote:
Now... a question about realities.. The POH nazi's will say that the
Word as written is good, praise be to the POH... if I base flight
decisions and speeds on MY calculated numbers rather than the max weight
sea level standard day numbers published in the almighty POH.. am I
going to be asking for trouble here?

I'm not sure what it is that you're asking here.

The POH gives you experimentally derived performance numbers under
stated conditions. There are standard formulas to extrapolate those
numbers to other conditions of temperature, altitude, etc. A typical
POH will contains tables or graphs showing these extrapolations for a
number of various combinations.