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 - Talk of the Town: Diesel Vs. Gasoline - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I am in the market for an older tractor (to be read... cheap). I have been told a diesel holds up better than a gasoline engine as far a wear, tear, neglect and abuse. Since I am looking at older tractors that have probably been through it all, is it better to buy diesel? I do expect to have to do a good bit of work on
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