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The turbo compound engines fitted to B29s and Super Constellations went from 200 hrs- 600 hrs time between overhauls when run rich of peak EGT to 3,600 hrs time between overhauls when run lean of peak.
Mmmm not sure how many B29s etc used in cilivan use ?
And not all big turbo compound engines used lop all the time ether. You can not compare apples to oranges or lyc cont to large cap P&W or wright engines. Example of the r985 was an example only of the difference between mil tbo and cilivan. Sorry you could not see that. Back now to tuning pianos