I have a 2008/4500 !! Over 500K !! 12-14mpg ! 6.6 ! Truck has taken us all over the Country !! Very pleased ! VALUE built in ! Little too much plastic ? Rattles n squeaks ! Chase them down,n repair or restabalize n find another one !! Can’t imagine replacing it !! It has to die an EXPENSIVE repair !! BUT a GUH has a standing offer of $8K 😬😬