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The thing about BSFC, is that it's both load and RPM based. Load is quite transient, and typically an engine is sized large enough that, during cruising, you will always be either at a lower RPM or lower load than provides peak BSFC. Because BSFC islands are wider than they are tall, the best you can do is to have tall enough gearing to get as near full load as possible while cruising.
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