According to my observation, with cruise control on, even on very constant steep climb, I am talking about 7,000 ft elevation mountain pass not freeway overpass, the speed remained constantly same. There were downshifts with RPM jump, but the RPM drops down soon. The downshifts sounded and felt quite smooth. All that seems quite logical to me, the auto is trying to maintain a steady preset speed going up hill, doing what it was ordered to do.
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