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Unless you have a REALLY REALLY big pump, you are probably going to have an inefficient setup. The key to keeping your efficiency up is to match the power to the pump. The little black book has the numbers on horsepower requirements/head/pressure. A little math is completely worthwhile here.
The other problem I see is a governor. You can buy a belt driven governor, or an oil pressure controlled governor, but I've never done this. I just did the math for a pto hydraulic system for a type 6 wildland fire truck using a 6bt, and it made enough power at IDLE to run the required 2kpsi@10gpm to run a hydraulic powered fire pump at 100psi@100gpm give or take. I think it was drawing something like 5hp. Not enough to even finish the math. Most pumps using an air cooled engine (especially gas powered) overpower the pump by a factor of almost 2 to 1 to keep the engine from overheating due to duty cycle, so pulling numbers from manufactured products can be quite misleading. They do this because otherwise, the gas engine running full load with a 100% duty cycle would roast in no time.
But if you can run it at idle, or low rpm, and load it up, you fuel efficiency would probably be pretty stellar.