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I use the 85 octane gas most of the time. I only put 89 in if I am towing or will be towing a heavy load so it's mixed in my tank. Good idea! I'll start running all 89 so it becomes straight 89 and see if that changes anything.

Thanks for the ideas and input, I've had this truck 10 months now watching all the variables and the one that is always the same is altitude. Every time I drop below 6400 the MDS starts working. I don't think it's normal. sorry to be in disagreement but I've seen plenty of other trucks, thanks...

Hi All, My truck is a 2022 1500 5.7. Since the truck was new the eco mode has not worked above 6400ft. but works as expected below 6400ft. It's not user error.(the eco mode in my 2018 ram worked fine everywhere) 2 dealerships have told me they can't help me. I only rarely get to elevations...