A fellow boater just posted his readings on another thread. I was compelled to graph them. His engine is a Perkins 6.354 (twins) which is roughly the size of my ADC Ford Lehman 135. These readings should not be far off from your FL120 in terms of the curves and sweet spots in the graph. His are twins, but as I read his numbers, fuel use figures appear to be per engine. So what I can extract is a sweet spot around 1800 RPMs.
All current, prop pitch/diameter, hull shape parameters will impact this, but use as you wish as a guide.
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Ben
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