Two different things there. You"re comparing gallons-per-hour (fuel use) versus horsepower-hours-per-gallon (power divided by fuel use). With hh/g a higher number is good. It is useful to compare tractors with different amounts of power.
The G produced 38 HP while burning 3.9 gallons per hour. For 9.7 hh/g.
The 560 produced 63 HP while burning 5.2 gallons per hour. For 12.2 hh/g.
The 560 burns more fuel, but produces more power. The higher hh/g figure shows that is also more efficient. It creates 1.7x the power while burning only 1.3x the fuel.
To be fair, the model G was tested with 43-octane distillate while the 560 was tested with 84 octane gasoline. That alone would make it more efficient.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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