#1 Engine size matched to work load #2 Compression ratio #3 Engine worked at correct RPM for peak torque, work done at peak of torque curve = best eff. #4 HD or LD advertised horsepower rating
Fuel ecomony with any tractor directly relates to engine size versus the job being done.
For example, and old Ford flathead, gas engine 8N can run a 4 or 5 foot brush hog more efficiently than a new 150 horsepower turbo-diesel Deere tractor. That because most tractors that are very efficient when worked hard, are inefficient when used at low power.
One example - running a 5 foot brush hog that might need 15-25 horsepower, The higher the number, the more fuel efficient. An old Deere B or Ford 8N is almost twice as efficient as a new 160 horse Deere in this situation:
Deere B - 11.7 eff. test rating Ford 8N - 11.1 eff. test rating Deere 7630 turbo-diesel - 6.5 eff. test rating.
An 8N Ford can make 25 horsepower with a rating of 11.l horsepower hours per gallon.
2007 John Deere 7630 turbo-diesel. When worked at 161.8 horsepower it is rated at 18.16. When worked at 92 horse it drops to 14.3. When worked at 62 horse it drops to 12.4. When only worked at 31 horsepower it drops way down to 7.6.
Another factor is how horsepower is stated. Horsepower alone means very little. Horsepower that is sustainable over time means a lot more. With heavy-duty diesels, usually, or at least formerly, horsepower was expressed as a figure an engine could produce all day long, and not in short spurts called "max horsepower."
HD engine makes in the past often expressed horsepower both ways.
The more conservative the power rating, the longer the engine was projected to last doing that kind of work. Very often identical engines would have totally different ratings between HD equipment and LD equipment. Even different yet if installed in electric generator plants that might run for months at one speed.
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