Info on my trip home with fuel mileage. I can honestly say that the predator helped the fuel mileage IMHO.

Mountain driving, Cruise set around 77 MPH
474 miles on tank
32.003 gallons
14.8 MPG

Flat ground, cruise set around 75 MPH
490 Miles on tank
26.905 gallons
18.21 MPG

Flat ground, cruise set around 75 MPH
503 miles on tank
29.98 gallons
16.78 MPG

Some mountains, cruise set around 75 MPH
421 miles on tank
22.2 gallons
18.96 MPG

Total miles driven - 1888
Total fuel - 111.18 Gallons
Average fuel economy - 16.995 MPG
Driving time - ~27 Hrs
Average speed - 69.93 MPH
I just rolled over 27k this weekend and I have a 06 6-speed

I have a 6.7L.2 weeks old with 1700miles. the truck said that its getting between 11 to16 per gallon. im realy hoping it gets better.How many miles do you guys have on you 6.7L ? Did the mpg get any better? my dads Dmax started to get around 20mpg at about 30k.Are dodge's the same?

My 6.7 has 10k miles and gets 13.3 and is going back in the shop for a 4th time tomorrow I wolud really like to see some of that great fuel milage

My 6.7 just rolled over 9,500 miles and get between 14.5 and 16 MPG (hand calculated). I have seen upwards of 18-20 MPG, but that was only one tank. I have bben pretty consistant woth the 14.5-16 MPG since turning over 5,000miles.

I just got back from a 4hr ride up the intersate 87 . the truck said that i was getting 15.8. thats between 65 an 80 my truck was in the shop a few weeks back they told me that they flashes the comp with the new updates. thats all that i know was done.

I got the flash update as well. I am only seeing around 11.5 to 13. I have to do a lot of in town driving tho. I have seen 16ish once i get to take a fairly long highway trip.

Which flash? AU? I noticed a decrease in mileage after the AU flash. I talked to the service manager and he told me the AU flash retarded the timing a bit, which would explain the drop in mileage.

I will tell you that I do a lot of in town driving. It is 12 miles to my business and here in Houston that can take up to 30-45min to get to. One thing I noticed after an 8 hour trip was even in traffic AFTER the trip, my overhead never got below 14mpg until one day it started to drop more and more. This got me thinking that perhaps with all this in town driving I never completed a regenerating cycle. So now once a week I take it about 30miles round trip to complete one. The mileage never goes below 14 unless I start hammering it!

Hope this helps some-

BigD

yeah i guess my truck just sucks for mileage and i have no clue why.......

With my 35's, if I keep it under 70, the best I can do is 19 mpg... thats downhill with a headwind.. In my daily commute, and 35" tires, I am seeing about 15mpg.

i don't think any new full sized pickup can get close to 30 mpg