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 - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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