Depends on what you mean by "less than fast idle or rated RPM". Rated RPM is usually somewhere in the lower 2000s. Peak torque range is usually in the mid to high teens. On both of my tractors 1900 RPM is just ahead of the peak torque bulge. That's where I pull them. Fuel savings are noticeable. Check the Nebraska test ratings. John Deere has been, for a number of years, running their drawbar tests at both the rated RPM, like 2100. And then running at a lesser RPM. Usually 1900, but lately they've brought that down to 1750. Take a look at those numbers.
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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