I have twin 3208T 250hp cats with 1100 hours. I run between 1800 and 2000 rpm, 8 - 10 knots.
Its a 54' trawler with a 17' 6" beam.* I have only had the boat a year but so far they have started and run great. I have had to rebuild the raw water Jabsco pumps and change filters, oil, zincs, basic...