Hydrostatic drives are supposed to be more efficient is what I've read. Anyway, work is work to the engine. If I'm cultivating or pulling a disc making the tractor work or using the skid steer, either engine is under a good load. The tractor probably more because it can be under heavy load for a long distance, while a skid steer is usually under heavy load for short bursts. Hydrostatic crawler loaders will out work a torque converter machine by about 3-1 but have about the same HP. In my case, the tractor has an AD3-152 Perkins which set fuel economy records. It's also a bigger engine than the Kubota, 152.7 cu inches vs. 113.5. Dave
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