What to expect

[brinker]

Im a 6.0 but my aunt and uncle are looking at a 6.4 for towing their camper and some driveing around. What could they expect mileage wise out a stock truck and what would be need to get more out of it. They aren't looking for big power just a good tow rig the gets good mileage. Also are there any problem areas on these trucks? Also anything else i shold let them know. If i had the time i would do more reading before asking but i have been busy and don't really have time. Thanks

[t613]

Experiences may vary, but here's mine...

Stock truck will pull almost anything. Mine gets about 12-13 on the highway empty. Never towed a heavy trailer very far, but pulls my 5000lb. boat at about 10 MPG. Regens(self-cleaning of the Diesel Particulate Filter) are inconvenient and cost in the MPG department.

Some of the '08's had thermostat/radiator issues, but I'm still on the originals.

Many on here have had good experience with tuners (Spartan seems to be the most common) with the DPF delete (bypass pipe), although illegal for on-road use... Mileage is reported at 1.5-2 MPG better overall. The power will be more than they need!

Good luck with the assisted purchase!

Tim (originally from Armada!)

[2006PSDSD]

My neighbor claims 18mpg on the hwy doing 65mph in his 08. Pulling, he sees closer to 11-12. Personally, I think they're too quiet!

[blackcloud2k]

65 mph on the interstate unloaded an tuned Ill see 18.5 mpg or so. Towing it drops down in the 14 range. Doing 75-80 on the interstate nets me 16 mpg unloaded. Issue wise the job 1 6.4's had some radiator, and injector issues. Mine is a late job 1 and I have never had any issues. If they look for a job 2 or 3 08 or an 09-10 they should be problem free. The regen process is a what is really hurting these motors. Both in longevity, and mileage. The regen process introduces fuel into the oil and causes dilution. This is not good for the longevity of the motor. If they are comfortable with deleting the DPF it will suit them well except they run the risk of voiding the warranty. All the parts are easy to put back to stock though. I agree these trucks are to quite. The sole reason I went from just a DPF delete to a full 5 inch exhaust was to hear the motor. I found it hard to tow with the truck with the radio turned up because I couldnt hear the motor and would actually have to look down at the tach to see if I was lugging the truck out. With the 5" on there now you can hear the motor a little better.