As a regular, I ask the question often. Why?
Becuase, when asked, the reply is almost always 'no speed control'. If I assume that there is none, then I am breaking the requirements of the STAR that is being followed. I have to add that when I hear of holding at WILLO or TIMBA then the question doesn't get asked coz I know what the reply will be. But when we can maintain high speed then it is nice...Its still quite a way from GWC to 26L, or just south of DET when going to 08R.
Whilst we are on topic, I find a frustrating thing is being instructed to maintain standard speeds (or even 220kt), only to be told by director (unprompted) that there is no speed control. Happened at least 5 times over the last two weeks.
I will say that if the frequency is busy I don't ask and just do...