What mileage to you see on the highway with your Dodge Diesel with auto transmission? I am looking for trucks with the newest version of the engine.

 

Im not gona vote because I have a 6 speed but I generaly see 14-20 depending on speed. IF I can keep it at 60 or so on 2 lane roads I can easaly be in the 18-19 range but I rarley drive that slow. The faster I go the worse it gets. anything over 75 and I juat as well be pulling heavy because it will drop to 14 or so in a hurry. I have found that pulling heavy at 80 mph only cost me a few MPG vesuse running empty at 80 MPH. I have tryed to slow down now that fuel is more expensive.

 

I pull down about 19. I'm lifted 4.5" with 35" tires and 3.54 gears. Mods in sig.

 

Best of 20.5 MPG.
Cruise set at 64 mph (approx 2100 rpm).

 

Coming home from Texas after buying the '98, I had one tank at 19.6 in Texas and Oklahoma and that was mixed driving! Next tank was mostly highway at 18.8, and we were hammer down Bone stock 12v

Chris

 

Sorry about the older engine but i get 15 on #2 and 16 on B100. Freway usage daily at 70 mph average. I have 355 gears

 

My average is about 21mpg as long as I keep it under 70mph. Had a best of 24.5mpg cruising at a constant 55-65 for a good distance. But with this new ULSD, I don't know, seems it's down about 1-1.5mpg now . Time will only tell though.

 

My best unloaded sustained highway mileage is 24mpg. This is at 55-60 with the cruise control.

 

You really have to be more specific about what you want than to simply ask about mileage. It is completely variable. And right away you get the people reporting X mileage as the best they've gotten for y distance. It's all meaningless. Anyone can get 25 MPG anytime they want by driving at 45 MPH with a tail wind on level ground or down hill. It's the real world average that counts. Conditions that are easily met and comfortable to maintain. Like several thousand miles of a given commute without resetting the computer or by keeping accurate records with an accurate speedo. The rest is BS.
You might call it BS if I report mileage of 200+ MPG. But it's not. I get that in my VW about 50 times a day. Every time I take my foot off the loud pedal at highway speed and begin to slow down, the mileage shoots past 200. So what? It's a useless figure to report for comparison. Like saying that on Thursday I was on some trip and for a few miles on a straight stretch of highway that was level, I got (some big number) MPG, OK, so what? Well why not say "I got 10 mpg while towing 6000 lbs over the Sierras" Ok, that's nice too, but how does it relate to someone else? When you start the truck in the driveway your mileage is zero and gradually climbs, with abrupt highs and lows, as you pull away and begin your trip. With me and a 100 mile commute, the mileage climbs for about the first 50 miles then stabilizes. Then it varies with hills, stops and wind or speed.
Everyone drives differently. It would be nice if we could come up with a real world comparison, but I don't know how. Too many variables and too many stories.
I know I get far better mileage under all conditions than I ever got with any gasser I've had. And I know if I keep the speed down and the acceleration easy, it will do far better than if I don't. And towing or going up the mountain it does worse than coming down or empty. Those are simple comparisons about things I can control. My truck gets used for highway commuting, hauling materials, towing my tractor, travelling in the mountains and four wheeling in the high desert. After about 80,000 miles it has averaged about 16-18 mpg. But, it has also gotten far less and far more under some conditions, like sitting and running at high idle to charge batteries or a nice casual cruise home from Reno.

Wetspirit

 

I can get 23-24 mpg with the right conditions present. Flat ground with no hills, turn the boxes off, and keep it around 65 mpg. I used to get my best numbers at 60 mph but ever since the injectors and turbo upgrade my mileage goes down at 60 mph..
Under my normal driving conditions, slightly hilly terrain and 75-80 mph, I get 19-20 mpg.... AT 85 mph mileage drops down to 18 mpg. Any faster than that and who cares!?!?!?

 

I will be doing a 1300 mile road trip to see the Parents in a couple weeks. Ill post after I get back. I havent had any long highway runs as of yet.

 

Flat hwy, no load & 65 I get between 18.5 & 20.

 

100k miles stock and never got close to 19 highway. 2wd/3.73

FASS-II for 5k and Bio-20 and still 17 is the bext day I've ever had.

My 4x4 7.3 Powerstroke gets the same thing I'm getting in the CTD (I fugure 4x4 and DRW cancel each other out)

 

Well i just took a 4700 mile trip to Oregon and back and my over all mpg there and back was 18.3 with about 800 lbs in the bed to Oregon and a littles on the return trip. This also included 200 miles in to yellowstone park on the return trip to IA. My lowest was 17 and best was 20.3 and all mpg is caculated with a caculator and not the over head trip computer than never read over 17.8 mpg.

Truck is 100% stock, but I did use 8 oz MMO and 16 oz PSD (gray bottle) every other tank of fuel. After this trip I now have 6500 miles on the truck.

 

2003 2500 4X4 5.9 Cummins 41000 mi.

On regular trips between northeast Missouri and Northern IL, 260 miles one-way about half on interstate, we average 21-22 mpg.

Around town about 15-17.