Just put 6. 800 on mine. Round trip from AZ to NY towing a 6x10 with a GoldWing. Absolutly perfect. The auto with the exhaust brake is great. The only complaint I have is the Fuel mileage and the POS drivers seat The best I got was 13. 5. I hope it gets better as it gets broken in, it had 400 miles on it when I left home. .
When I got my 2006 3500 auto, the fuel mileage was sort of OK, but not great. When it turned 40,000, it made a huge increase in fuel mileage, and again at 80,000. I've got 150,000 on it now, and haven't seen a major increase. It is consistently over 20 miles per gallon, calculated, but I don't drive it over 65 mph. I found that the mileage took a significant hit over that speed, so I just don't drive faster.
I have a 14000 pound tow behind toy hauler, and so I installed an Edge Attitude to give me some more towing power to make up for the 48RE. It worked. I also get around a 5% increase in fuel mileage for normal driving with the chip on setting 1 (economy). I didn't add any other components like intake, exhaust, - nothing.
I have never tried the chip over setting 2 (towing) so I have no idea what happens.
I have been so happy with my 2006, that I ordered a 2010. I have been reading with interest all of the posts about the regen, and admit that I'm just a little bit nervous. But whatever. I fell in love with the new Dodge interior, and just can't wait to make payments again. <<grin>>.
I hope that the reported lower milieage of the 6. 7 will improve when the motor gets 40k on it.
Oh, I did have the dealership install a Jacobs when I first bought the truck. In my opinion, NO DIESEL should be without one. I have still not had to change brake pads, and the feeling of safety going downhill with a big load on, is worth every penny.
Just my . 02.