tball the thing is
Hey Josh, I raced downhill. I've done 70. It's doable, even on rec skis. I don't doubt it. Downhill/SG training? Sure . Speed gun on a specific place and day on the hill with the goal of going fast in mind? Sure. What I question and indeed doubt is the notion that people do it regularly just cruising all bro braw-y around the ski area. I just haven't seen it, and yes, I know what 70 looks and sounds like. Anyhow.... If I ever do a speed gun run, I'm doing it on DH or SG skis, but that's just me.
I think at snwobird I probably hit 50-55 daily. I think at Stowe due to tightness 40 mph is probably the max with out trying, and as Tball point out I think even the fastest trees i ski are probably 20 mph at stowe. I need to take my GPS out next year, just never thought about it this year.
Tball the thing is I have not memorized any of the woods at A basin and since its soft woods I can not see, here in the east you might be able to go faster because despite being tighter than even the tight front side trees, you have a much better line of sight as its hard woods.