Originally Posted by Stu Jackson
It really doesn't matter.
Over the course of operations, you'll run your engine at vastly different rpms.
ALL you NEED to know is the average fuel consumption, and what you did by running around and refilling is exactly how to do it.
With all due respect to Mr. Jackson,
Average consumption is a nice to know; but what you really NEED to know is, in a pinch, what "performance" can I get per hour at the low end (max endurance/range) or, if I need to run fast for weather/tide/daylight/injury, do I have the fuel to do that. For instance, how fast can I make a Closest Point of Approach" to get/give help. I may need to adjust my plan if the fuel available prevents me from fighting a foul tide to make my destination. At what throttle setting do I get my "hull speed" and in what sea state does adding throttle just waste fuel for no incremental gain.
If you don't buy the safety aspect, think about a plan to buy fuel in the least expensive places by giving up half a knot (500RPM) to get there with some reserve.