The problem occurs when you bring the number of plow bottoms each is pulling into the equation. The 4040 tested at fully twice the drawbar horsepower as the D but your math isn't giving it credit for that. You're assuming both are running at 100% maximum load with a 5 and 3 bottom plow, respectively. The other piece of of information that isn't being considered is that the maximum drawbar power of the 4040 occurred at about 5.5 mph while the D was less than 4 mph.
The fuel cost per acre is a different thing than fuel economy. I'll not argue at all that with the current cost of diesel fuel it takes significantly better economy to pencil out over gasoline. The fuel economy data from the test reports is objective and constant but what this means to fuel cost per acre is subject to the fluctuating fuel prices.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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