Just ran Manta PowerCat 44 number 2 back from the Miami show to Ft. Lauderdale. Volvo D4 210 hp engines (max rpm 3400) with half tanks and full cruising gear, relatively flat seas recorded the following offshore and intercoastal. Rpm 1400 Speed 8.1 knots Fuel consumption 1.6 gals per hour Rpm 2780 Speed 15.5 knots Fuel consumption 12.3 gals per hour Rpm 2890 Speed 16.5 knots Fuel consumption 13 gals per hour