It's easy, actually. The vanilla game's fleet boats use a fairly accurate max range set at 2kt (96 miles). However because 2kt is not a normal cruising speed, and because the game's calculated range decreases geometrically with speed, by the time you hit 4kt there's a serious range reduction. By simply changing the 'control' speed to 4kt and using an accurate range at that, you get the right result.
Then there's the S-class for which the devs used a 5kt base speed with 100nm range, using the same source that you quoted it seems.
The underwater range should generally be set at a normal slow cruise speed, otherwise things start getting wacky. SHIII (at least with mods) used about 3-3.5kt and the results were right.
I'd love to find an accurate 4kt range for the S-class now...
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