From what all of you are saying, it sounds like the 25% fuel economy improvement figure is in the ballpark. The steel wheels punched into the ground whereas rubber tires float on the ground with the lugs coming into play when applying pulling power. I've never driven a steel wheeled tractor but could see how steel wheels could pound a man into peeing blood after plowing rough ground day-after-day.
Speaking of pounding, even with rubber tires, tractors can be a rough ride in some fields. Today's big tractors have cushy, shock-absorbing seats to provide a smooth ride. Were there ever any vintage tractors made with springs and shock absorbers? My guess is the springs would hamper getting the power to the ground as they loaded and un-loaded with changing conditions. They would also interfere with load leveling hitches. I may have answered my own question, but was there any that had springs? How about that rare MM tractor/car? It probably had springs, right?
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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