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I was thinking of the debate in this thread, especially posts #22-36, where they discussed the idea of overall horizontal velo. There are other threads on Tango's site on this topic, including this week.
The Nov. 16 and Nov. 22 BP articles by Fast are here and here. I didn't look up anything else, as far as what the MPH means.
Come to think of it, it wouldn't make any sense to have a "90-120 MPH" category if you were talking about anything other than launch speed :- )
Feel free to take it from here, Matty. I'm going to look at some prospect stuff so maybe I can sit down as student and you can step up to the chalkboard on this topic :- )