I just stumbled across the specs of a Hattaras 54. Thought you might be interested in how others live. It displaces 73,000 lbs. It is powered by 2 1550 hp Caterpillar diesel inboards. At 2275 rpm and a maximum speed of 40 knots it consumes 164 gallons of diesel fuel per hour. Luckily it has a 1250 gal. fuel capacity. Bill Effros