Sounds like what we need is a constant throttle position based cruise instead of constant speed, or at least a constant speed with max tps. maybe some hysteresis based on how much throttle for maintaining speed on "level" so that it doesn't surge to high throttle for uphill or high speed on downhill, like a plain constant throttle position or throttle lock (on my motorcycle for instance) will do. I live in a very hilly area, and often when i hit a hill i kick off the cruise and just rest my foot against the "hump" at the throttle position that was keeping me at speed, and let the car drag down to whatever speed that will maintain on the hills.....which can be 60 down to 40 at times.
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