Ed Anderson wrote:

However, when you say inlet temps - do you mean inlet to your ducts or is that the inlet to your throttle body.  The  reason I ask is 90F seems very high for OAT at 6500 MSL and since you are using that figure to determine your Delta T across your cores, you need to insure that it is correct.

Ed,

   I'm not that familiar with Dennis's part of the world, but - as
hot as the PHX area gets - there are places in Texas and Florida
that get hotter on a given day and weather.

  FFZ (Mesa, AZ) is roughly 1400' elevation.  If the ambient
temperature at the field is 110 - which it often is,.this time of
the year - the temperature at 6500' is ~95F.  (And I'm glad to have
that *cool* up there.)

Dale R.
COZY MkIV #497 Ch.12