You are looking for "the holy grail" or "tilting at windmills".
Diesel tractor engines (on the average) range from 13 to 19 HP hrs/gallon at full load (a pretty narrow efficiency range, actually), but some are better at light loads than others.
For your hypothetical 60 HP vehicle a certain engine running at a certain speed in it's powerband is gonna look pretty good.
Trouble is in the real world, how much of the "driving cycle" is gonna be at full rated HP and RPM's and in the engine's "powerband"?
That's why vehicles today have a 5, 6, 7. 8, or even 10=speed "slushbox", to keep the engine running at a speed where it's most fuel-efficient.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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