If you want another set of data, take a look at this video I made of
the Open Cirrus. All the instruments were calibrated, you can see the
30 sec digital averager on the panel top, the timer on the lower left
with the altimeter will give you a timed measurement, and the Winter
on the left is a 2 min averager. This flight is on OLC if you want
the GPS data.

I don't have time to comment on you results, except to say reread the
Johnson and Bikel articles on test measurement.

http://www.youtube.com/user/aerodyne.../2/GJLeuUYbWdM

aerodyne