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Kyle,
That's a great point about a controlled study of engine longevity. It's strange that the manufacturers haven't done this, but I suspect it would only further illustrate their poor QC.
What would you expect to see if you tested two identical engines in exactly the same conditions, power settings, fuel flows, leaning techniques, temps, etc.?
This is exactly the environment in which twins operate. You might argue that a Skymaster front vs. rear engine is not an identical installation, so let's leave that out of this example. A conventional twin with a right and left engine are operated this way.
Just look at Trade-a-Plane and see how many twins have very different times on their left & right engines. Continental & Lycoming can blame pilot operation all they want, but this example clearly shows that the problem with these engines is in the manufacturing.
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