I just drove from TX to MN and got a high of 17.5 hand low of 13 ( diffrence of 55 and 75) Then just towed my gooseneck 200 miles and got 8. its a 40 ft featherlite enclosed.

 

We buy more fuel, burn it "cleaner" for the environment, and the extra money for the extra fuel and cleaner envirnment can go to paying for other gross polluters.

If I recall, stationary pollution accounts for 70% while mobile pollution is 30%.

Just another form of socialism.

 

I pointed this out to Envrionment Canada...their top guy. He was really surprised how my fuel economy impoved with the emissions stuff removed.
I was told he was going to look into this and let me know the response from the manufacturers and the folks legislating these changes.
Its been about two years now...I am still waiting by the phone...because he said he will get back to me.
He probably got told [ $ ] to keep his mouth shut and Don't worry bout it.

Scotty

 

What helped my trucks fuel economy was unplugging the egr valve. I got an honest 3.5 mpg gain in town and on the highway running empty. Towing, it made no difference, I attribute that to how the egr works and engine load. If I decide to keep this truck, the smarty will come and deletes will happen this summer.

 

19 to 21 mpg (Imperial) empty, locked on cruise at 110 kph.
14 to 16 mpg around town empty and depending on how heavy my right foot is at the lights.
12 to 16 mpg depending on weather, pulling our 8,000 lb travel trailer with 1,000 lbs in the box, locked on cruise at 110 kph.
Figures are hand calculated. Highway figures are on highway #2 between Edmonton and Calgary, based on several trips.
I don't even bother calculating any more because with out a doubt this is the best tow rig that I have ever owned. This truck will haul our travel trailer with the water tank full, all our provisions and supplies plus 1,000 pounds of equipment in the box, up hill and down all day long, with the air and stereo on. The cost to operate is 40% less than any gas pot I had and they pulled smaller trailers. I should have bought a Dodge Cummins years ago. We tow about 20 to 25,000 kms per year, so I probably could have saved enough to pay for a new trailer!

 

Thanks everyone. It sure sounds like it's a hit or miss on good fuel mileage with these trucks. I'm thinking about test driving one this week to see if I like it. Keep the reports coming guys! I'd like to see what everyone is getting, and I'm sure everyone else does too!

 

My 04.5 5.9 never did get over 15 on the road... My o7 6.7 will pull 16.5 -17 on the road at 70. 6.7 is way better for pulling my 40 ft fifth wheel. ( But everything is deleted on my 6.7 I mean everything)

 

If I wasn't ready to buy a new one I wouldn't test drive them! I had a 1999 2500 Cummins and I liked it alot but I got the bug and started test driving Dodge and Fords it was game over! These new trucks are so much more comfortable and have the power stock that my 1999 had with a TST Comp.
My guess is with Dodges new truck and keeping the same 6.7 since 2007.5 and the new interior they will clean house in 2011 & 2012 maybe longer with Ford and GM coming out with new more complicated engines that will have to be debugged.

 

I don't think it's hit or miss at all. There are a few general guidlines that sum it all up well. The '03-'04 305/555 trucks get the best of the three and always have. The '04.5 to '07 5.9s get about 1.5 MPG less. The 6.7s get even worse mileage by up to 3 mpg or so. If you disconnect the EGR on the 6.7 it makes up for a lot of the difference.

Adding a Smarty and using the timing feature helps the earlier years ('03 to '07) and maybe the 6.7, I don't know.

Driving them easy does more for mileage than anything else but the same driver will get better mileage in the earlier ones. The overhead is not accurate and the mileage must be hand calced over many miles to mean anything, and then only with an accurate odometer that is calibrated for the tires on the truck. Mileage stated at a certain speed is meaningless. Averaging it over distance with both up and down hill, into and with the wind, etc gives numbers you can rely on.

 

Both of my trucks are stock right now. My '06 2500 gets around 18 MPG, and my '08 3500 gets 15.5 MPG.

I plan on doing a little bit to each truck to get more performance and mileage, but most of it is just replacing or adding the things these trucks should have came with.

 

Locked on cruise at 110 kph - 18 to 21 mpg depending on wind etc.
Locked on cruise at 110 kph, towing 8,000 lbs and 1,000 lbs in the box - 14 to 16 mpg. These are hand calculated figures in Imperial.
The truck is stock except for a gutted intake tube, an aFe drop in and a 4" hole in the bottom of the stock air box. I run the EGR unplugged.

 

Full deletes added around 2mpg for me
17.5 running around and 20+ highway with 3.73 gears
Deletes are a must.. pretty poochy without

 

I run between 15 and 17 on the highway, 12 to 14 n town and about 12 towing our TT which weighs in around 7500. The biggest variable seems to be how heavy my right foot is. I am running 3.73s and am still bone stock except for having the EGR disconnected. Can't wait to get the deletes done so it can breathe.

 

I stay around 65mph, get about 20mpg avg. If I drive from high altitude to lower (do down hill) I'll get around 22 and have watched it go as high as 28 for short periods.
I'm in the military so my on post driving is very slow. I get about 15mpg there. Really hurts the soot issue to drive around that slowly.
I have a 6.7 and a 5.9. The 6.7 is extremely nice, smooth, powerful. The 5.9 is simple and reliable. Would love a mix of the two.
Would also like to really start learning about these things, in detail. Love the diesel platform.

 

friends of mine pulled an enclosed sled trailer (with an 07.5 w/ intact emissions and a 68rfe) to idaho and back almost 2 years ago and got somehere in the vicinity of 8 mpg (imperial), that truck was the reason i bought my 06 to avoid emissions (sorry, got kind of off topic)
mine so far is a 14 -18 mpg truck depending on speed of course