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Cruise control has a lead foot

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My new 2019 Highlander (LE 4 cyl) as a very crazy cruiser control program.  At 75 mph (I live in Texas) any small hill or overpass causes the transmission to downshift from 6th to 4th gear.  The trans. stays in 4th gear for miles after the crest of the hill.  I mean like 3 to 5 miles.  All the time the engine is running at 4,000 RPM.  I can take the same hill without cruiser control without downshifting at all for the most part or perhaps downshifting to 5th for a few seconds.  I've taken it to my new Toyota dealer and they say that's within normal calibration.  I objected because it's never been normal on any other car I've ever owned.  Has anyone noticed this same thing?  Is there an after market solution?  


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