It's hard to tell, but it looks like the specific fuel consumption is lowest around 2400 rpm. Clearly it rises sharply above 2800 rpm, so you want to keep it below that. I'd say anywhere from 2200 to 2600 rpm will give you good results. Better to have some horsepower in the bank in case you underestimated your requirements and to allow for engine wear.
The reason engines in gensets run so fast is because they need to maintain a fairly constant rpm regardless of load. In order to do that, they are set up to run close to the speed that gives maximum rated horsepower, even though they spend most of the time producing only a small percentage of rated power.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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