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Message: <blockquote data-quote="RichV" data-source="post: 1238612" data-attributes="member: 17007">Love those 5.9s.Not sure what deletes are going to send your mileage through the roof, My experience is just the opposite. Average is 18-22 depending on heavy your foot is, that's a 04 2500 shortbox/crew. Mine is the 5.9 HO, everything is stock except a K&N in the box and a Edge/Attitude tuner. With zero tune you'd hardly notice anything 6K lbs behind you at all, so any open trailer with a car is a walk in the park. A big and loaded enclosed trailer will definitely let you know it's there, and a little bit of a tune will help over the hills.I'll be putting mine up for sale in a week or 2. It's got 210K miles, and Cummins with those miles are still wanting $15-20K. That's just crazy to me, I bought it with 43K miles for $24K about 6 years ago. I'm kinda on the fence with selling it, but I just got a '14 2500 Cummins and just can't justify keeping the '04.</blockquote>