High rpm will not hurt the engine (diesel or gasoline) nor increase the engine wear. Most engine wear (up to 90%) comes on the first 15 seconds of a cold engine start. It is much worse to lug and engine (low rpm at full throttle), so let the little diesel sing - that what is made to do. Higher rpm on diesel engines do not decrease fuel mileage the way it does on gasoline engines as diesels have not a "throttling loss".
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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