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I see alot of people getting over 20 mpg empty 14 towing, i hope there not doing that with dually's, because im getting 16 empty 13 towing. my dad has a 2001 dually with the 8.1 and gets 12 empty 7 towing, so im not complaining just wondering.
 

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With 43,000 on our truck, I have gotten 20.4 one time. It was a trip from Raleigh to Knoxville and back on I-40. Deliberately drove to get good fuel mileage. Example mostly at 1900 rpm which equals about 64 mph. Hard trip ... everything on the road ran off and left us!
When I run her at interstate speed she drops to 17-18 .... around town (which isn't big city driving by any means) she'll usually hit 16+ ... Jim
 

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I seem to average just about 15 MPG no matter what. Once on a very long highway trip where I stuck to the speed limits I managed to get almost 18 MPG. I'm not complaining since my much smaller, much less fun, much less tow capable Suburban only got 13MPG average and towing the small trailer it got 8-9MPG. This baby gets about 12MPG towing a 32 ft trailer with 2 cars in it.
 

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My brother gets 17 mpg all day long in his dually.....mostly 55-60 mph driving....Me with a ext cab sht bed...I can get over 18 mpg on the highway.....I really only get with half towing a 2 ton trailer in town and the other half all highway I always get between 14-16 mpg....In comparison with the 6.0 gasser I never, never no matter WHAT..got anything better than 11mpg...snowplowing forget it man nuttin better than 5.5 mpg....Now with 1.89-2.00 bucks for gas man....were all laughing our way to the bank. I guess until they raise diesel prices too...Bill
 

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I have a 2001 k3500 10' flat dump (9200lbs) It tows a 7,000 lb trailer 99% of the time. All in town driving. 8 mpg. When I bought the truck (12/26/2000) I drove it home 200 miles on the highway. It got 10 mpg. The dealer is checking this now along with several other things.


I have a 2002 K3500 CC. ( 7200 lbs) It gets 16 mpg around town. Its pulling the 7,000 lb trailer this week while the 2001 is in the shop. Im certain that the mpg figure will be much better with the CC.


I still Love my Duramaxs
 

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I consistently get 14.7 to 15. However I drive mostly around town. I have gotten almost 18 on a two hour trip. Certainly can't complain about that in a truck that weighs this much and is a joy to drive.
 

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I usually get around 14.5-15 mpg every tank. We took a 5 hour trip this summer and got a little over 16. I have noticed, as I'm sure most of you have that just jumping from 60 to 70 mph makes a huge difference in the mileage. Also, the figures that I have quoted were figured by using the old tried and true method of filling up and dividing that into the miles covered. The mileage figure in the DIC has been as much as 1.2 MPG off versus the mentioned method. It has been as close as .2 MPG, but it is usually off more that that. You would think that they would install a flow meter to more accurately gauge the amount of fuel used. Is this asking too much for a $40,000+ truck?
 

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I get around 15.5 MPG on average. Used to get around 13 that sucked. Did not do anything to get the better mileage, it just happened.

My best has been 18.6 right after fuel filter, oil change.Edited by: Mcfly
 

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I've gotten 18+ mpg once on a long, slow-n-easy highway trip. Typical mileage towing a 13,000 lb. horse trailer is 9-10 mpg at 62-63 mph. I consider this mileage to be more than acceptable for towing a very heavy trailer with a large frontal area. BTW, 13-15 running errands mixed town and highway, but I've got my VW TDI (47+ mpg) for serious going places economy.
 

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Fuel mileage stories sure are interesting! I wish my calculator worked like the rest of you guys calculator did. I don't have a 3500, but mine seems to only get 15-16 mpg in everyday driving 17-18 mpg on the highway and 10.5-11.5 towing a 5000 + pound travel trailer.
 

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Yeah, first liar just doesn't have a chance. I get around 15-16 HWY (70-75) and 8-9 towing 14K at the same speeds, and I'm happy with that.
 

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Well I used to have a mileage log but have since stopped,


I have 70+k miles on my 2001 K3500 CC Long Bed. I tow an 11Klb trailer. Very consistent 11-12 MPG towing and a flat 15-15.5 daily driving. Like some people have posted. I got over 18 mpg a couple of times unloaded going 55-60 but who in their right mind drives that darn slow????



I routinely do 75-80mph empty and towing. I am very happy with the towing power and the MPG. I have a friend with a 2002 CC LB Gasser dually, he gets 11mpg daily and 5mpg towing coupled with gas at $2.10 a gal where as diesel fuel is $1.70.


There were a lot of people that said the Duramax option price would not be recoup'd..I beg to differ. 2x+ MPG and 20%+ less price for fuel...



Best Regards
 

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I have kept records since day 1 for 36,000 miles and I have an overall average of 13.9 MPG. I had a low of 8.1 and a high of 20.3. This includes towing a TT weighing 8800 lbs and two fuel tanks full, tow tool boxes and GCW of 16,100 on the CAT scales. Most of my driving has been empty and I drive 70 to 80 at times but normally 70-72. I recently have been setting the cruise at 2000 RPM on the highway where possible. I am totally satisfied with the mileage. Sure beats the 454 4WD 3/4 Suburban I had.


Tom
 
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