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One observation from looking at all the BSFC charts in this thread is that for optimum fuel efficiency over a period of time (i.e. many trips, days, months) it is best to target under-shooting the sweet spot a bit. This is because the gradient between the contour lines is shallower on the underside. When one over-shoots the sweet spot, it is easy to get into quite higher fuel consumption situation. Missing the sweet spot a bit on the lower side of the doughnut hole matters less.
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