Common private jet engines such as the Williams FJ44 has a bypass ratio of just 2.8:1. Installation requirements aside. From an engineering perspective is there much to gain in efficiency by going to a higher bypass ratio on such small engines?

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    $\begingroup$ I guess private jets doesn't fly that much to justify the increased cost with fuel savings, especially in a segment so far away from "economy". $\endgroup$ – user3528438 Feb 25 '20 at 23:16
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    $\begingroup$ Lower bypass ratios are more efficient above 45000 ft where most bizjets are designed to cruise. $\endgroup$ – John K Feb 26 '20 at 0:34

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