My former ~20,000 pound Nordic Tug 37 with a single 330 hp Cummins 6BTA sipped 2 gph at 7.5 knots, 3 at 8.5, 6 at 10, and topped out around 16 gph at 17 knots.
My current Maritimo 52 at ~60,000 pounds with twin 715 hp QSM 11s drinks 4 gph at 7.5 knots, 7 at 8.5, 12 at 10, 30 at 17, and will hit...