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In our 2016 Ace, I never use cruise control on grades, and going down steeper grades at slower speeds I always push the "tow" button which downshifts when you touch the brake. On ours it works extremely well. We live in Wyoming and have crossed some very steep mountains with it without a problem. On the interstate we found if we used cruise control when climbing the transmission would down shift way too soon and to a gear lower than needed. The cure was not use the cruise control and not use a heavy foot. It has worked will for us in Wyoming, Montana, Idaho and Nevada.
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