My understanding is when conducting the Nebraska tests they ballast the tractors as required to obtain their maximum results--they are not allowed to make engine alterations or remove/disconnect things like alternators and hydraulic pumps to improve numbers. They test all tractors in as close to and identical environment as they can. The Super A falls quite a bit below the 8N in those tests.
Still IMHO I'd rather have a Super A over an 8N. But I admit that it still depends on the major task it is to be used for but I feel it's often under appreciated when compared to the 8N. Downsides: offset pto, tall under trees, less stable on a hillside, less lift capacity. Upsides: great operators platform, good visibility and clearance, live hydraulics, independent hydraulics for front and rear applications (push blade on front, scoop on rear at the same time), hydraulic down-pressure (great using the pulverizer and with a back blade there is no floating up when going over bumps), I found the hydraulics had finer height adjustment control, and as I recall the engine access was much better too.
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