From the specs I've read from Nebraska Tests, nobody is going to be "blown away" from better fuel efficiency with newer tractors. There certainly are some specific gains at certain steady power levels (mostly 150 horsepower and up), but on average the new tractors aren't much different then they were in the 1970s when it comes to how much work is done per gallon. In fact, in the 50 horsepower range, many are worse then those tested 20 years ago.
A few examples. Note the 1965 MF beats the much newer tractors listed. So does a 1958 Deere:
Massey Ferguson MF150 diesel, tested in 1965, as thus: 37.8 horsepower at 17.8 horsepower hours per gallon. 35.3 horsepower at 18.1 horsepower hours per gallon. 25.1 horsepower at 16.4 horsepower hours per gallon. 17 horsepower at 14 horsepower hours per gallon. 8.5 horsepower at 9.6 horsepower hours per gallon.
Case IH CX50 diesel, tested 1999 at thus: 42.5 horsepower at 15.2 horsepower hours per gallon. 37 horsepower at 14.8 horsepower hours per gallon. 28.2 horsepower at 13.5 horsepower hours per gallon. 18.9 horsepower at 11.1 horsepower hours per gallon. 9.5 horsepower at 7.9 horsepower hours per gallon.
Case DX 48 diesel, tested 2004 as thus: 40.9 horsepower at 12.2 horsepower hours per gallon. 36.6 horsepower at 12 horsepower hours per gallon. 27.9 horsepower at 11.6 horsepower hours per gallon. 18.7 horsepower at 9.7 horsepower hours per gallon. 9.3 horsepower at 6.4 horsepower hours per gallon.
Kubota L5030 diesel, tested 2006 as thus: 43.5 horsepower at 14.2 horsepower hours per gallon. 30.7 horsepower at 12.9 horsepower hours per gallon. 20.7 horsepower at 10.7 horsepower hours per gallon. 10.4 horsepower at 7 horsepower hours per gallon.
New Holland Boomer TC50 diesel, tested 2008 as thus: 43.6 horsepower at 13.2 horsepower hours per gallon. 28.8horsepower at 13.6 horsepower hours per gallon. 19.4 horsepower at 11.9 horsepower hours per gallon. 9.7 horsepower at 8 horsepower hours per gallon.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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