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John, Although you bring up some good points, I think your wording in you post gives the reader the impression you were being mean spirited. ( Some of us know better ) I think "the safety is just roaring" sets the tone. It is a challenge to find that "sweet spot" in any given run, balance between the fire, axle pump by-pass, weather conditions, and loads.
So If one is after the most efficient use of their fuel looking for the longest run time, a light load is more efficient to achieve that end, however if "work done" is the goal then, finding the most efficient load, speed,burner setting, cut off etc. make it a bit more complex... Henry seems to be after efficient use of WATER, in his experiment? To that end, standing for a long time with the safety open will skew his findings as you were pointing out.
 
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