Ok, I will admit that I have a piece of 3/4" dowel about 20" long with a wire hose clamped to it so that when against the pedal and the wire stuck under the edge of the dash it will give 47 mph on the long flat stretch that I have to drive every day. I found the correct adjustment through trial and error. It works, but I would prefer a CC. Like you say it slows going up hill and speeds up going down hill.
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