Well that depends, are you still defending this statement you made earlier...?
"What I am saying is that there is no mystical bias in engine performance with pressure vs temperature as engine performance IS determined by Density Altitude."
It seems to me that their definitely is a bias and that density altitude as a yard stick is not as straightforward as you are suggesting with this statement. Aren't you both in fact saying the opposite, that DA is not DA is not DA. That it all depends on the PA/Temp combination for a given DA, supported by your 'charge' theory which to my limited intellect seems to make sense.
Otherwise, everything's just fine!
Thanks for all your help!
Irlandés