Jeff,As a rule of thumb, 2 PTO HP per KW output. Fuel usage & PTO RPMs will vary with load. Rememer: a Diesel idles at about 100:1 fuel/air ratio, and about 25:1 under full load. Theses ratios are only numbers, and vary among make, model, age & usage. It is probably safe to say that a 50hp unit would use less fuel than a 40hp running the same generator, mainly because the 50hp wouldn't have to work as hard. Also, that 155hp unit might be a turbo diesel, a compact isn't. Governor or not, a tractor can only maintain what it has to offer. If the generator is capable of overpowering the tractor at full load, RPMs will drop. On the other hand, a tractor with 50% more hp than Max output of the generator probably wouldn't be fazed by the load.

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