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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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