Fascinating sh!t. Thanks for the info. I really badly want to get into boating when I get in my 50s. Really bummed I haven't already but it always seems so far out of reach when it comes to money. Even with money I'm doing the math in my head and it's just insane what you have to be willing to drop to get a decent little boat like that one pictured.For the Viking, a decently brisk troll 7.3 kts is 2135
20kts is about 600.
30kts is around 470.
An Azimut 83 with a 6000 gallon tank has a range of 400m at 14kts.
It's going to depend what your yacht is for. Some of these are luxury yachts for never leaving the Mediterranean or the Eastern US/Carib. Some of these (like the Viking) are for a run to Bermuda with a slow speed cruising portion at night, but they want to get to seamounts or temperature/current breaks quickly during fishing tournaments.
Like Mundus said it will depend on the cruising speed and also style of boat. What gets from Miami to Bimini or Monaco to Ibiza in a serious hurry is not built for oceanic passage.
So if you're just keeping the boat in the Mediterranean and just cruising that area, how often would need to fill up per year? These guys boat every day or just weeks at a time?