I generally go for target speed + about 5-10mph near the bottom of hills.
Lots of Interstate highways have hills here, so I shoot for 60-65 (for example) and scrub down to 55-60. Based on the hill, speed, load, weather, and payload, there's a pre-determined throttle position to get the job done. It's something that's learned with practice.
There is a point-of-no-return for my automatic if I lose momentum. Sometimes a heavier foot and higher speeds results in a better hill climb -- but avoiding acceleration is key.
There's a great downhill highway run on one of my routes that allows EOC and acceleration beyond 70 downhill! But, what goes down, must go up again...
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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