Irv,
That reminds me of a story I heard a long time ago at Welshpool (when it was under the old managment, not the present ones). An instructor took out their PA28, and on final for the 800m hard runway he realised he couldn't remember the approach speed. He used 80kts for safety, and....well, I was told the story when I asked about the large hole in the hedge at the end of the runway!