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That 90% figure is cited in many owners manuals as well as the maximum % of time at wot. Befor you start running 90% make sure your engine turns it's rated rpm at wot.
As most have mentioned, Best fuel Economy is a function of hull type, various engine parameters, prop type and size, loading etc... That is why I suggest you figure out where the sweet spot is using a gauge. Some engines have computers built in that have a NEMA 2000 bus that sends fuel consumption data and you might be able to display this in a chartplotter data window. Otherwise something like a flowscan meter works, but they are a pain to install and even more of a pain to calibrate, but they are accurate. They keep track of all kinds of fuel data.
Posted from my iPhone/Mobile device
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