A small point but what you call hp-hrs really hp-hr/gal straight from the Nebraska test charts. You use the correct numbers but your labels are wrong. Does not affect your results since you are using the correct numbers with the wrong label. More important for those math folks that like the labels to fit to insure the equations are correct.
The efficiency data does not lie. I know there are those that think the Nebraska test is bogus but they never explain why or how. The Nebraska testing will explain their methods and what they indicate in the listing for most of the tractors tested. I see no reason to think their data is not accurate. The efficiency, hp-hrs/gal for the 4020 and 4040 is greater than for the D.
The Nebraska test does not always list the hp-hr/gal for their drawbar pulls but you can use the variable power data they list for a pretty good estimate. Comparing the drawbar pull at differing loads and the newer tractors still come out ahead.
If a 4020 will pull a 5-16 plow then, in your soil, I expect the D would be a 2-16 tractor. You will have to get the D and do a comparison to find out for sure.
Horsepower is horsepower, does not change with the engine type. A mower engine of 15 hp has the same horsepower as a steam engine of 15hp if, and a big if, they are measured the same way. Horsepower takes into account several factors including speed and torque so it is a good way to compare engines. It does not take into account the torque range or curve. I expect your 15 hp Reid engine would be more than 15 hp if measured using modern methods. The rpm of the engine, slow vs high speed engine, has nothing to do directly with the hp rating. I also expect the Reid engine has a very broad or flat torque curve which allows the engine speed to change a lot with less effect on the horsepower than an engine with a narrow or peaked torque curve. The large flywheel will also store power in the form of inertia and will let the flywheel power through short additional loads without needing a large input from the engine itself. A lawn mower engine does not have that large inertial mass to help it through short load fluctuations and must depend on the engine itself. I also expect the Reid engine is truly more than 15 hp.
In the end, you do not have to justify your decision to any of the YT "experts" since it is not their money nor do they know your situation. Get the John Deere D and have fun! Lots of 4040s out their, a lot less of the Model Ds still around.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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