Homer, Speaking for myself, I certainly wouldn't expect 170 kts from a PA31 to a one or two mile final, unless it was a trashed out midnight box/check hauler. Because sure as heck I asked a typical owner to do that, I'd get a three minute lecture on the causes of Cylinder cracks and the current replacement cost thereof. I don't work any DH-7s or 8s around here, but even the Caravans I work will generally do 150 kts or better till short final unless the vis is really bad. And they think we give too much priority to the jets. Perhaps true at times.