Posted for "Mike Smith" <MSmith982@mn.rr.com>:

 There was one trip I was flying form FCM to CDW.  I saw 410 knots for about
 45 minutes at 25K in my lowly TSIO550 nonpressurized IV.   Too bad- I kept
 it in the Garmin flight statistics until they updated the software and
 erased it.  It is not uncommon to see 350 knots eastbound in the winter
 winds.  I guess the turbines are about 30 knots faster at altitude.  Is that
 worth twice the fuel burn?
 
 
 
 Michael Smith