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It'd be interesting to see how much the peak power decreases over the lifespan, I assumed the main reason for swapping out the engines was more for reliability reasons (though engine wear obviously correlates to engine performance and likelihood of going pop in a similar way). Though I'm sure there's also an element of turning the engine down over time to stretch the lifespan.
Yep there was some chat around the by-passing of the fuel-flow sensors by Ferrari a few pages back (I found this page with a bit of info: https://it.motorsport.com/f1/news/direttiva-fia-39-19-sulle-monoposto-un-doppio-flussometro/4600511/). I don't think we'll be hearing the full story for quite a few years but that ^ sounds in line with everything else I've read on the matter.
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mmccarthy
I think it's definitely true that ultimate engine power decreases through the lifespan of the engine. The extent to which it does, and the cumulative of engine wear throughout multiple races, is one of those metrics which I gather is a closely-guarded secret, hence the use of older PUs in less power-dependent races. AIUI, one of the benefits of the now-outlawed Ferrari fuel-rate 'cheat' modes is that it allowed greater power without the engine performance degradation which you would normally expect with the usual 'party mode' settings by using a higher-than-permitted fuel rate to provide the extra power rathan than momentarily exceeding the PU's usual parameters. That said, that information is hearsay from a 'friend of a friend' source, so it could be total bollocks. I'm still not convinced it's not true though...