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I have run Rams. My 05' with a Quadzilla chip in it got 12 to 14 mpg pulling and 24 empty (calculated). My 2012 gets 9 pulling and about 16 or so empty. The mileage of the Rams dropped 4-5 mpg with the inclusion of the DPF and EGR emissions devices. I believe those were added in 07.5???
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