ShaneCTD600

Should I go ahead and get the 6.7 assuming the MPG will get better or just keep my current truck until they get this thing figured out?

Txturf

What is all this talk about a re-flash? Just Curious have only 1700 miles on my 6.7 but seems to run fine avg 14 mpg in the city, no load 9-10 with 20'gooseneck

Motec

I have a 07 with the 6.7 3500 TWD SRW 6-speed manual. It has 5000 miles and I'm getting 17 in town and 20 on the open highway. Just made a quick 700 mile trip @ 70 to 75 mph. I got 21.7 mpg. Keep in mind that this is a two wheel drive. I have the tail gate spoiler from a 1500 but everthing else is stock.

h8pvmnt

I took my 07 2500 4x4 6.7 auto on a 3hr road trip to Silver Lake Sand Dunes and with the cruise set to 70mph I got 18.23mpg

I have a little over 2000 miles on it

duckbill

If you have a 5.9, keep it. If I could turn back time I wouldn't have bought the new one. Lost 4 mpg towing and 6 mpg empty to work compared to my 03and it could pull anything I hooked to it. I have 11k on mine and the milage isn't getting any better. Actually I think its worse. I already told a friend of mine I will give him a good deal on it.

GMScott

33k miles on the clock. Like anything 1st year out, the consumer becomes the best R & D (guienea pig). If you got the patience and don't mind some inconvenience go for the 6.7L/Auto. My 07 6.7L, not counting the poor fuel mileage right now, is 2x times the truck that my 04.5 was and my 04.5 ran great with fantastic fuel mileage. If you look @ my sig, I had over 330k miles worth of seat time in 2 1/2 years with the 04.5. My trucks are used for work, don't want alot of down time or dealer visits. So you learn and find things out as you go. For instance I found out that you don't have to take it into the dealer every time the CEL lites. 5 good starts and most of the time it will clear. There is alot of electronics and sensors on the beast and they're bound to have a glitch once in awhile. As long as that's all it is, it will clear up. Heck, even the PC you're using to read this hiccups once in awhile, right?? I found out from my dealer that if the codes are "stored" and not "active" they're not going to waste any time trying to figure them out anyway. Barring any major problem, let'em clear out themselves.
Around 27k miles I noticed that my 6.7l started to get better mileage, just like my 04.5. When the 04.5 hit 50K, fuel mileage started to get really good. ex. I almost got 22 m.p.g. (empty) over 650 miles @ a cruise controlled 75 m.p.h. Hand calced it came out to just over 21.5 m.p.g. Not bad?? Towing anything up to 18k lbs. the 04.5 would get between 12 & 14 m.p.g. @ 75 m.p.h.
I'm expecting to get a "little" less with this truck due to the EGR but I'm hoping the different gearing in the trans will make up some for what ever the EGR takes away. @ 75 m.p.h. I'm cruising right around 2k r.p.m.'s. The 04.5 would cruise @ just over 2,200 r.p.m.'s. Plus, I travel the same route alot, so where the 04.5 would downshift out of OD on some of the hills on I80, the 6.7l sails right over. Another difference I have noticed, when the 04.5 came off OD it would take forever or have to almost hit the crest to upshift back into OD. When, and it doesn't happen that often, the 6.7l drops out of OD it literally throws you back in the seat and starts gaining r's to upshift back into OD, on the upgrade of the hill!!
Right now, my 6.7l is suffering from a stuck EGR valve. STAR won't let my dealer just replace it. They have to jump thru some hurdles like getting an "EGR Kit" and cleaning it out before they can just replace the $700.00 valve. Frustrating yes, but I would'nt go back. I'm sure fuel mileage will be back on track once they get this problem resolved. Might as well get used to the "greener" cleaner stuff - it's here to stay. Sorry for the long post.
Just my .05

mr. ed

I just had my new truck re-flashed this morning (2007 3500 RAM/6.7 CTD/6-speed manual/about 1600 miles). I must say, I'm impressed with the increase in performance. The idle seems smoother and she reaches 1800-2000 RPM (my shift point) a little quicker than before. I can't wait to perform a mileage test. I wasn't too impressed with the avg. 12 MPG around town (hand calculated) I was getting before.