Yeah, I can't even get close to that speed anymore, when I did that I weighted around 220 and must have had quite a tail wind as well. I'm a little over 6' 4" tall and 180 lbs now and the fastest I get moving without some assitance (tail wind, drafting vehicles, etc) is around 55 mph too. I like going fast up to a point, but when I start approaching the mid 50's it stops being fun and starts being a serious test of my concentration. I'll sacrifice the 9 mph in descent speed for the vast improvement in my climbing from the weight loss any day though.