Actually, Test No 605 shows the 720 gas used 4.51 gallons an hour under maximum load. (55.11 hp ÷ 12.21 hph = 4.51) You're figures came right for the diesel in test 594 though. (56.66 ÷ 17.97 = 3.15)
The problem with your comparing the two tractors is that the soil doesn't figure into the economy--the tractor does. A tractor that's burning twice as many dollars per hour as another tractor but is not doing twice as much work per hour is going to cost more per acre to run. That's what the 4020 is doing, compared to the D, when it costs nearly double an hour over the D which is doing more than half as much work.
Smaller machines always have more wear on them. Take a narrow combine head vs a larger one: the small one has more passes per acre than the big one, and even running the machine faster won't help save wear.
I mean no disrespect at all to any engineer anywhere, and that includes you. Thank you for thinking this through with me.
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