You read too much catalog BS my friend. Iv spent alot of my life arround Dodge Diesels and I can tell you from experience that the truck pictured gets tops 23mpg on cruise at 60 and with a tail wind. The only way to get into the 25+ range consistantly is to bag it to 5", belly pan, tonneau cover, ramped intake injection, eliminate the clutch fan, eliminate emmissions controls, street spool cam, conservitive injectors, faster spooling turbo, and the right foot of a 80yr old lady. Seeing as thats a 3rd gen common rail without the egr its easier than the newer ones to get mileage but at 6-8" of lift you can only do so much.