You forced me to look up the production numbers, which tell an interesting story.
Out of over 20,000 Spitfires built, almost exactly 1 in 20 was a Spitfire XVI, which of course served for a fairly short time (as Franek points out, some early IXs were serving for years, as were many Spitfire Vs.)
So if in 9 Spitfires was a XVI, you'd expect in 9 engine failures to be as well. In fact, if there were 9 engine failures in Mk XVIs, you'd expect 180 in all Spits, and yet Six Nifty .50s says there were only 162, which gives the XVI a slightly higher failure rate than average.
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I have to say that I never saw any complaints concerning Packards in Mustangs used to chase V1s but that they worked quite rough. Perhaps no direct comparison to RR Merlins there?
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Neil Sterling would be the best person to ask, as he has dug a lot of information on 100/150 fuel and it's use out of the British archives. I believe the information about the Spitfire XVI stopping the use of 100/150 early came from him, but I can't find it at the moment. One of the things I found though talks of timing problems on Packard built engines when running at 25 lbs boost that aren't present on RR engines.