i m sure you know how it works... Once a boat goes above hull speed fuel burn increases much faster than speed. For instance a 55 footer will...
Keyword is indeed CORRECTLY. If you have a cores transom you d better be sure whoever drills the holes first uses epoxy to isolate the core....
running at 10 to 15 knots or a boat in the 50/65 range makes no sense. It s complete waste of fuel.
Thank you for giving more details, looks like you replied while I was replying yesterday for the US and Bahamas, range is not critical as fuel...