Steve is correct that we fly slower as we get lower, but that does not mean you should fly slower than your MC setting. In my first posting I stated that the MC should be set to the thermal strength you are willing to stop for. Rather than flying slower than an unrealistic MC setting, turn the MC down to what you are willing to take.

As Uncle Hank said there is no perfect answer that fits all situations, all decisions depend on many other factors including the conditions and terrain ahead.

John Cochrane's article "Just a little faster please" is a must read on the topic:
http://faculty.chicagobooth.edu/john...ring/index.htm