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Old 04-20-2013, 05:23 AM   #1
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MPG for 2013 Duramax?

Hi. I have a 2009 LMM 2500 and get 10.5 MPG towing my 5er. I am looking to upgrade to a 2013 dually to better handle my 5er. Should I expect any difference in towing MPG with the newer model motor? Thanks.
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Old 04-20-2013, 06:02 AM   #2
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Quote:
Originally Posted by azdryheat View Post
Hi. I have a 2009 LMM 2500 and get 10.5 MPG towing my 5er. I am looking to upgrade to a 2013 dually to better handle my 5er. Should I expect any difference in towing MPG with the newer model motor? Thanks.
I had a 2011 3500 Duramax srw pulling about 15 K and got somewhere around 10 mpg (depending on conditions) pulling the 5er and 18 solo. I now have a new 2013 Duramax dually and get about the same.
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Old 04-24-2013, 06:35 PM   #3
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I have a 2013 CC 4wd LML stock and am getting about 15.3 hand calculated with city/ highway combination unloaded winter blend fuel just off the lot. Putting a 4000 mile trip on this summer with a 12,400 trailer and am expecting around 11 or better based off my LMM I had. The LMM was getting about 13.6 off the lot in 2007 winter blend fuel combination unloaded driving (same exact truck model). Towing with the LMM I was getting 11ish running about 60 with the same trailer. I am happy with the 2013 thus far and it isn't even broke in yet (1500 miles).
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Old 04-24-2013, 08:23 PM   #4
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I would bet on the normal of around 9 pulling 15k, wind will put it to 7 and maybe 11 downhill with the wind. Good luck!
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Old 04-28-2013, 10:26 AM   #5
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mpg for 2013 Duramax

Made the same move going from an 07 2500 to a new 3500 dually and found the milage to be close both towing and empty around 10.5 towing as you stated. That being said your trip will be so much more enjoyable with the stability the DRW offers, good luck in your decision.
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Old 05-02-2013, 06:54 AM   #6
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Just finished a trip from Beaumont to San Antonio and back (650 or so miles) and the computer calculated 10.1 mpg (normal conditions). I have checked the computer against hand calculations before and find they are very close. My 5er is around 15.5 K.
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Old 05-11-2013, 10:13 AM   #7
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The only way you'll get a noticeable mileage change is if you do a complete system change on it, i.e. turbo back exaust (at least 4" - 5" is better), a good programmer, or better yet a pre-programmed ECM, a cold air intake, and good syn oils (all of em). There are many good systems out there, but Kennedy Diesel for an ECM, or a Banks system are the best around. I'm running a Bullydog GT, 4" exaust and cold air intake on my 2007 6.6 dura LBZ and I regularly get 23-25 on the highway empty, and 13 towing a 15k FWTH (no water). Two things will kill you on that '13, well, aside from it being a dualie (more rolling resistance). The cat and the DPF. Get 'em off there if you can (exaust system change), depending on what state you live in. If CA, you're screwed. Just FYI, I beefed up the bed carrying cap of my 2500 with bags and shocks, and it'll carry anything the 3500 will, bed wise. (Same truck, just two extra tires/wheels). The two extra tires give you a bit more CC, but not enough to warrant the extra money...and a dualie is hard as hell to park and you can't run it thru car wash lol!
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Old 05-17-2013, 05:08 PM   #8
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No reason to expect any difference. Actually with the DRW the mileage will be negatively affected. The DRW is needed for a 5th-wheel greater than 17,000 lbs. and pulling that much weight is not going to be good for fuel economy either.

Fuel is burned whenever the engine does work and with a heavy truck and heavy trailer and above average amount of air drag towing a 5th-wheel will provide the worst fuel economy of any RV. Better not to think about it.

The LML does improve on the LMM engine which has a design flaw with gas injected into the cylinders at the end of the combusion cycle and some of this diesel ends up in the crankcase. Not unusual to do a motor oil change and have more "oil" come out than originally went into the engine.

Fuel tank capacity helps and I am changing out the stock tank on my truck for a larger one. The chassis cab heavy duty trucks can be equipped by the factory with dual tanks for 63.5 gallons of fuel capacity in total and this would definitely be worth considering.

I did a count of trucks pulling 5th-wheel trailers on a recent trip and out of more than 100 trailers counter I found more than 80% of the trucks used were SRW.
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Old 05-18-2013, 03:41 PM   #9
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Amen brother. DRW is not a necessity in most cases. Lots of folks think there is a big diff between the DRW and SRW....like I said....with Chevy, its the same truck except for two extra tires/wheels. Same axle, same brakes, engine, transm, everything. I'm told some have an extra leaf in the springs, but the one's I've looked at are the same as mine. The wider track does give a small amount of stabilized handling, but to me it's not worth the extra fuel and tire expense. Just one opinion. There's a million of them out there. I've pulled my 40' Fuzion all over the western US and have had ZERO problems with power, braking, or handling. Remember tho, I put on air bags and the best shocks I could find.
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Old 05-18-2013, 03:59 PM   #10
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I pulled my 18K 43' Toyhauler about 4500 mi with my 07+ 3500 SRW D/A. It pulled it fine and I got about 8 on flat highway, no wind. I now pull the same rig with a 2013 F350 DRW. Mileagae isn't much better, but the stability is like night and day, especially in a crosswind.
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Old 06-07-2013, 04:29 PM   #11
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***UPDATE BY OP***

I did get the dually and just towed from Tucson to Sacramento and back. Averaged 12.2 mpg according to the dash display. Absoluetly love this new truck.
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Old 06-10-2013, 04:42 PM   #12
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Here are some recent numbers you may be interested in. Drove from Beaumont, TX to Seattle, WA (2600 miles) at the speed limit usually 70 to 75 mph and got 10 miles per gallon pulling my 15.5K fifth wheel. Drove from Seattle, WA to Prince Rupert, British Columbia (1,400 miles with a couple of side trips/speed limit 55-60/ mostly hilly to mountainous) and got 11.2 mpg. Did not use cruise control and let it loose some speed on inclines before allowing it to downshift. My truck does much better at lower speeds.
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Old 06-30-2013, 10:03 AM   #13
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I bought a 3500HD SRW and pull about 13,000 getting between 10 & 11. I took truck to Michigan early June (no trailer) and got 21.2 on the way up. Ran from Kansas to Michigan on one tank I was impressed. Avg 20.2 fog 1800 mile trip. Have no issues pulling 37' columbus
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Old 06-30-2013, 12:22 PM   #14
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Originally Posted by RetiredFPD View Post
Amen brother. DRW is not a necessity in most cases. Lots of folks think there is a big diff between the DRW and SRW....like I said....with Chevy, its the same truck except for two extra tires/wheels. Same axle, same brakes, engine, transm, everything. I'm told some have an extra leaf in the springs, but the one's I've looked at are the same as mine. The wider track does give a small amount of stabilized handling, but to me it's not worth the extra fuel and tire expense. Just one opinion. There's a million of them out there. I've pulled my 40' Fuzion all over the western US and have had ZERO problems with power, braking, or handling. Remember tho, I put on air bags and the best shocks I could find.
The only difference I have seen is DRW dropped tires from 18" to 17". I like the looks of the 18".
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