You'd better recheck those Nebraska tests. Drawbar horsepower (in general) goes UP in the higher gears, not down. That's because drawbar hp is affected by wheel slippage, and you get the most slippage in the lower gears. For example, check out the test for the JD 7130. (Which I picked at random.)
The worst drawbar horsepower was in the lowest gear tested.
Drawbar horsepower is difficult at best to measure, since there are so many external variables, particularly soil condition. But drawbar horsepower has no bearing on gear ratios for highway vehicles. Presumably your wheel slippage is minimal when you're going down the road at 70 mph. If not, then you need to let off the gas a bit.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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