A F/E at KLM theorized the DC-10 was "hobbled" by the nose-down moment of the high #2 engine, causing excess stab trim drag. He proposed running #2 at reduced thrust in cruise to lessen trim drag.
whereas the DH 121 Trident had its centre-engine momentum drag above the c/l, and the thrust about in-line.
Slight assistance with trim drag
====
An historic miljet (1945 Gloster Meteor) regulary positions to airshows with one engine shut down. These are RR Derwents, some the earliest production Whittle based engines, and are stopped and started with complete confidence it seems, even in such an old warbird. They are a trifle juicy, so this makes a healthy improvement to its realistic range, as well as reducing hours on each engine (they both still have plenty left, fortunately
)