Most of the personal experience information is unscientific and often meaningless and I take them with a large grain of
salt. Each
boat even boats of same brand with the same motors may burn different amounts of
fuel for the given speed. What is important is the amount of Hp the
motor will have to transmit to the specific
gear and prop to push that particular
boat at that speed. As an example of this the
fuel use of my boat on launch day is no longer accurate nor is the top speed # all have changed with the addition of weight. With most
diesel motors old or new
school you will burn approximately one gallon of fuel for every 20 hp produced. If the boat is heavy-bottom dirty-tanks full or empty-prop and gears not optimal it can have a significant effect. The only reliable way to determine how a particular boat is functioning in this department is to get a calibrated method of measuring fuel
consumption and boat speed factoring in any
current and wind-age and weight of and state of tankage. For a less accurate but practical estimate you can go to the prop calculator on the Boatdiesel site and
plug in the needed #s on the boat in question and come up with some fair estimates.
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