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I had one on my 2016 cummins, I noticed it would downshift more on hills with it than it did without...assuming it is thinking you are stepping on the pedal harder, so it will downshift. I've also noticed that my 2012 and 2016 will lose more speed on hills while my 99 and 2005 never dropped speed at all. Can't comment on newer ones than 2016 since I am now in a 2019 hemi, but it's amazing that they seemed programmed better for cruise 20 years ago than they have been recently.