Yes, range/speed performance of Fleet Boats is really messed-up in SH4. Try TMO 2.0 - Duci wrote here lately he found very interesting fix of that issue during working on TMO. I tried his 9D2 Beta mod yesterday and I must say Type IXD submerged range value is as real thing! I am not sure about RFB 2.0 though...maybe next patch will fix this.
Anyway in real life 10 kt was optimal surface speed for Fleet Boats so you should get mentioned 10000 miles range easily...
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