<<19.7" MAP, 7.3 gph, 157 IAS, -5C OAT, 189 TAS, -9C TAT

  18.7 " MAP, 6.9 gph, 154 IAS, -6C OAT, 186 TAS, -10C TAT>>

Now this data I believe.  MAP isn't an exact measure of power, but if you
subtract maybe 4 inches from the numbers it is pretty close.  The fuel flow
isn't either, but it is probably close.  Assuming the normally accepted cube
root theory the following is expected:

1.  Using the MAP as-is the airspeed should have changed 1.7%
2.  Using MAP - 4 inches the airspeed should have changed 2.2%
3.  Using fuel flow directly the airspeed should have change 1.9%

It actually changed 1.95%, well within any reasonable experimental error.

Gary Casey