Originally Posted by Trawler Expert
Fellow said to me, OK this 48 ft twin 200hp each diesel trawler cruises at 12.5 knots and burns 15 GPH isn't much different from a 48 ft Convertible with Twin 800hp Diesels that cruise 25 knots and burn 35-40 GPH.
12.5 kts is probably approaching the worst speed possible for fuel economy.
Between 7-9 kts should be better.
IOW, his comparison is flawed.
We could reach almost 2 NMPG (less than 4 GPH total, IIRC) with twin 450s on our previous 42' Convertible... at around 7 kts, depending on wind/current/tide/etc.