The following is according to the Nebraska Tests, under full load.
The John Deere D makes 40.24 HP with an economy of 10.14 horsepower hours. Divide 40.24 by 10.14 to find that it burns 3.97 gallons per hour.
The John Deere 4040 makes 90.8 HP with an economy of 13.49 horsepower hours, so it burns 6.7 gallons per hour.
Now take the width of the plow and the speed of the tractor to find the acres per hour each plows. Divide that by the gallons it burns in an hour to find how much fuel it burns to plow an acre:
The D, pulling four 16" bottoms at 4 mph (2nd gear) plows 2.26 acres an hour, burns 1.76 gallons an acre and would cost $4.66 an acre.
The 4040 pulling five 16" bottoms at 3 1/2 mph (2nd gear) plows 2.83 acres an hour, burns 2.37 gallons an acre and would cost $7.82 an acre.
The answer shows that the D can plow an acre for less money than the 4040 can plow an acre.
But here's the common sense way to think about it--without doing the math: The 4040 burns nearly twice as much fuel as the D but is not doing twice the work. On top of that, diesel is more expensive than gasoline.
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