On airplanes often airplanes will have an Exhaust gas temprature for each cylinder so that folks building their own cooling plenums (air) can verify that all cylinders are running smoothly and equally. I beleive they just port the exhaust manifold at a uniform distance from the head with a high temp thermocouple. Sounds like a lot of work, but it would be interesting.

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1990 300D 2.5 Turbo 150k miles
1999 F250 7.3L Powerstroke 225k miles 22mpg
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