"they operate at 3000 while belt driving the generator at 3600 RPM"
Now what you're saying may be true of direct-drive alternators, it's certainly not the case here. Since they're using a belt-drive, Kubota has the option of running the engine at any speed they choose, and they chose to run it at 3000 rpm. And I was specifically addressing Blue's point about why THESE engines are run at 3000 rpm in a belt-drive generator application, nothing else. My positions still stands: they run them at 3000 rpm to ensure they have plenty of extra power so the engine doesn't droop under heavy load.
As for fuel consumption, there's no need to speculate as to what rpm gives best efficiency and how that relates to the engine's torque curve. Just look at the graph provided by Blue-Man: The specific fuel consumption is shown as the bottom line on the graph in the customary units of lbs per horsepower-hour. It's hard say exactly where it is lowest, but it's nearly flat from 2000 to 2800 rpm. With that in mind, it only makes sense to run the engine at a speed where it has plenty of horsepower on tap; better to burn a little extra fuel than to not have enough power to pull the load at all.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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