Hydro's are less efficient than gears, but more efficient than a torque convertor.
If you put the two engines under the same hp load ie take them out of the machines, they probably will use almost the same fuel with slight edge to the perkins since it is direct injection with a higher compression ratio. Most of what you're seeing as fuel use is the difference in machines.
The perkins in my Massey is slightly more thirsty in gph/hp than my little Kubota despite having a turbo. The massey is a newer model with some stiffer emissions requirements. I'm sure if I advanced the timing a bit I could solve that but I'm not gonna touch the pump until it needs it. (4000 hours so far)
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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