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Old 03-13-2013, 10:58 AM   #11
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Originally Posted by herk7769 View Post
The good news and the bad:

After much discussion with folks at campgrounds using the 2500HD with Duramax towing all kinds of stuff from "my size" (9,000 pounds) and up to 15,000 pounds (yep found WAY more than I believed possible); the fuel economy is exactly the same as I get. (yep, hard to believe, but the folks towing the big Montanas and Cedar Creeks with 2500HDs get 10.5 -12.5 MPG like I do.)

Not ONE of them has ever weighed their rigs (afraid to most likely) but all report "no problem" towing them.

If I had to give you "an average" for all conditions it would be 11.5 MPG.
You do realize WIND and SPEED are the biggest determiners in MPG when towing (camper frontal area being equal).

Towing into a headwind will KILL your MPG since the headwind velocity must be added to your speedometer speed to calculate the drag on your camper.

A tailwind on the other hard gets subtracted from your speedometer speed for the same calculation.

Since DRAG uses the SQUARE of the perceived velocity, wind and ground speed (speedometer reading) has a huge effect on what you get for economy since engine power has to overcome it as you drive.
I agree with that. I've towed different weights from small 4k trailers to our current 7500lb trailer and never noticed any big difference in mpg's between the trailers. I too average about 11mpg's give or take. I have to admit that using a Predator Tune set to MPG gains helped my NON towing mpgs to around 16-18 mpgs. I know people who are getting close to 20mpgs non-towing and I call BS on that.
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Old 03-13-2013, 11:03 AM   #12
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You may have had a south breeze going down and northern breeze coming home. I wouldn't read too much into MPG from one trip. My first 600 mile run was under 8. My average over 4700 miles that year was 9.25.
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Old 03-13-2013, 11:08 AM   #13
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I agree with that. I've towed different weights from small 4k trailers to our current 7500lb trailer and never noticed any big difference in mpg's between the trailers. I too average about 11mpg's give or take. I have to admit that using a Predator Tune set to MPG gains helped my NON towing mpgs to around 16-18 mpgs. I know people who are getting close to 20mpgs non-towing and I call BS on that.
I can get 19 to 20 HWY on a regular basis with my 05 D-Max unloaded ( no BS). I drive like I want the best fuel economy. In my opinion you have to find the sweet spot to get the best fuel economy. My sweet spot seems to be right at 1800 rpm.

NO tuner !! Not worth it to me unless you want more power.
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Old 03-13-2013, 11:13 AM   #14
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As already stated speed and road conditions are the MPG killers. I don't have a duramax but have a GMC with a 6.5 Turbo diesel. Towing my 14k girl she gets 10-12 maybe more depending, maybe less. I have figured out that I am not going to get there first or to the top of the hill before grandma n grandpa on a sunday afternoon drive.

It's the adventure and the drive not the speed at which I arrive. If I want speed I hop on the bike.
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Old 03-13-2013, 11:28 AM   #15
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Originally Posted by rubenz View Post

i agree with that. I've towed different weights from small 4k trailers to our current 7500lb trailer and never noticed any big difference in mpg's between the trailers. I too average about 11mpg's give or take. I have to admit that using a predator tune set to mpg gains helped my non towing mpgs to around 16-18 mpgs. I know people who are getting close to 20mpgs non-towing and i call bs on that.


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Old 03-13-2013, 11:43 AM   #16
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Yep Turbs, I get around 11 to 12 towing 12,000 lbs. and I have seen as much as 22 mpg but, not very often. It takes a lot of discipline to hold to the sweet spot but, it does pay off as well
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Old 03-13-2013, 11:49 AM   #17
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Bought a 2007 2500HD Silverado alison/duramax turbo with 72,000 on it.


Is it the old body style (classic) or the new body style? If it's the new body style you will have all of the emissions junk on it that really kills MPG.
If it is the classic body style you will have a lot more options on getting better MPG out of it.
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Old 03-13-2013, 11:49 AM   #18
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Yep Turbs, I get around 11 to 12 towing 12,000 lbs. and I have seen as much as 22 mpg but, not very often. It takes a lot of discipline to hold to the sweet spot but, it does pay off as well
As you said it can be done .
That's 12 miles of interstate and 30 miles of two lane which has a town every 6 miles.
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Old 03-13-2013, 12:09 PM   #19
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my mods are as follows and I have a 06 with the LBZ
larger exhaust from the turbo outlet back
PPE modded air box
airdog lift pump
trans upgrade
EGR blocked
pyro and boost gauges
EFI tuned on a DSP5 switch
stock tires at 80PSI
syn fluids all around
and a bunch of other stuff that do not effect milage

modified stock tune at 70mph winter fuel 19mpg, summer fuel 22mpg
heavy tow tune with 13k 5er 12.5 mpg @ 65mph
economy tune winter fuel 21mpg summer fuel 23-24
race tune 3-23mpg 'o yea' but the tires don`t last long
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Old 03-13-2013, 12:26 PM   #20
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Yep Turbs, I get around 11 to 12 towing 12,000 lbs. and I have seen as much as 22 mpg but, not very often. It takes a lot of discipline to hold to the sweet spot but, it does pay off as well
Cruise control liberally is the only way that I hold my speed down!
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