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The distance covered over the ground is utterly irrelevant, the RAF used a spiral climb at the start of the BoB, it may have been a bad choice, but it proves that they weren't in the least concerned with the distance over the ground, since in a spiral climb that is effectively zero.
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Completely irrelevant to the fact you don't cruise around at climb ratings. Even during a "cruise climb" your engine is set to a maximum continuous or below.
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Generally max climing settings could be used for level flight much more safetly beacuse there is better airflow by radiators which casue better cooling engine condition then in steady climb at the same engine settings. So if engine have 1/2 hour limit for max climbing settings it could be used even more safetly for level flight. The one thing which is imprortant here is just fuel usage. Just all.
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Right but completely irrelevant to the fact you don't cruise around at climb ratings. Better cooling or not, level or climb, it is an over boost condition on the engine and increased chance of failure.