Most/many tractors have been independently tested for power and fuel efficiency, google Nebraska Tractor Tests for actual data.
For example, lets consider an engine similar to your Model T but a little more modern, compression was 6.5:1.....wow. The 8N Ford was produced from 1948 to 1952 and was tested reference, Nebraska Tractor Test #443. From this, we see that during a 10 HR test operating at: 1749 RPM and 17.65 Drawbar HP, the fuel consumption was 1.74 Gal/HR. Fuel efficiency was 10.1 HP-HR/Gal, obtained by dividing the operating HP by the fuel consumption per hour. Assuming 17.65 HP at the rear wheels would drive your Model T at 60 MPH this engine could deliver 34.4 MPG (60 Miles/HR divided 1.74 Gal/HR).
Note: Since the energy content of diesel fuel is greater than that of gasoline on a volume basis, the HP-HR/Gal metric is a measurement of fuel efficiency and not engine efficiency. For engine efficiency the energy content difference between the fuels would need to be accounted for.
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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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