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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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