Last summer, I was impressed by the speed of the Norwegian hurtigbåt M/S Fjordprinsessa, operating near Tromsø, travelling so fast that travellers are not allowed on-deck and are recommended to remain seated and fasten their seatbelts. I don't recall the actual speed, but another of their boats does Tromsø – Harstad in 2h40m, a distance of around 160 km, meaning an average speed of 60 km/hour including one stop. Googling told me that the Fjord Cat on Kristiansand–Hirtshals does 45 knots or 83 km/hour, while the Shinas in Oman does 51 knots (94 km/hour), but I think those are maximum speeds and not average speeds. The Oman article claims "the world's fastest diesel-powered passenger ferry", but "fastest" can have several definitions, which leads me to my question:
What is the world's fastest point-to-point scheduled ferry route? By fastest in this context, I mean the distance divided by the time according to the timetable, similar to this Wikipedia table for trains.