new diesel owner here. bought my 04 2500 short bed 4- door 2 wks ago and i really like the truck. highway depending on wind i get 21 -23 mpg since it had 11 miles on it. my sister and her husband bought same style dodge a week later and when we compared mpg they are getting 14-16 at best. well now i know why!i never had a diesel before so the first thing i ask salesman when we looked at the ram that i bought was is this the 325 hp 600 and he said yes all 04 rams are the 600, so i said good that is what i want. so we test drove it, my wife and i and my sister and her husband. we all liked the truck so i got one and a week later so did they. i was bragging about my mileage and when we compared the two something didn't seem right. about 7 mpg difference. so i was looking at window stickers and noticed their truck had 325 -600 on sticker and mine didn't. then i started comparing both trucks under hood, i have a new 8-23-03 build date ctd 305- 355 and they have a 1-24-04 build date 325-600 boy was i p-----. but then i thought much better fuel mileage and it has so much power that i couldn't be happier. after looking i can see 5or 6 changes under hood between the 2 trucks. called salesman and he didn't know they made a 04 1/2. i told him that its a good thing that i like this 04 or we would have a big problem. so all in all i think i am better off with this 305-355.