wrote in message
...
[...] 130 kts
at 60% would correspond to 140 kts at 75%, which, not surprisingly, is
almost exactly what I get in the Arrow. (141 kts to be precise.) That is
still a far cry from the 156 kt "book" 75% cruise speed for the SR-20.

That's a number that a) is a lot closer to the published value than the one
you were originally complaining about, and b) is extrapolated by you, not an
actual reported value. You'll notice another SR20 owner reported nearly 150
knots on 10.6 gph. A variety of other differences could easily account for
the rest of the airspeed variability.

Pete