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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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