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Old 01-23-2013, 05:04 PM   #29
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I don't tow "heavy" yet but am thinking of getting a 30' slideout. I do add a Cetane enhancer which helps my mileage. 21 MPG on Highway is what I get too and that is pretty common on the forums. I'm surprised you bought the truck without a DPF. I always wonder about these "tune" software. Seems to me an economy tune would hurt your towing mpg because you're not getting the HP/torque. I am also surprised the dealer bought it from you without a dpf since these are mandatory equipment and he would have to buy one to replace yours. You could have had catalytic converter issues.
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Old 01-23-2013, 05:11 PM   #30
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Originally Posted by hamiltonmj View Post
I don't tow "heavy" yet but am thinking of getting a 30' slideout. I do add a Cetane enhancer which helps my mileage. 21 MPG on Highway is what I get too and that is pretty common on the forums. I'm surprised you bought the truck without a DPF. I always wonder about these "tune" software. Seems to me an economy tune would hurt your towing mpg because you're not getting the HP/torque. I am also surprised the dealer bought it from you without a dpf since these are mandatory equipment and he would have to buy one to replace yours. You could have had catalytic converter issues.
I think Steve is the one that said abra kadabra.
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Old 01-24-2013, 07:32 AM   #31
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Mike, I just traded an '08 Duramax, that somehow was missing the DPF, and had an "economy tune" installed, and that truck never got the fuel mileage you are getting. The absolute best it ever got towing was 15.5 MPG and that was with a 25 MPH tail wind all day long, and the absolute best it ever got solo on the road was 21 MPG.

You must have an exceptional one.
I think the difference may be the trailers pulled.. Mike is pulling a 19fter and Steve is pulling a 31fter.. I know once you get going it all wind resistance but there is a good weight difference just to get going and to pull uphill at times.

that may be the answer but i am just guessing.. how about fuel? some better than others.. ??

still good discussion on the topic and good to learn.
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Old 01-24-2013, 07:44 AM   #32
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15 towing is the general benchmark for A/S style TT's where fuel economy is concerned (given a diesel pickup truck). Less than that is rated "poor" (given the compromises a pickup entails).
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Old 01-24-2013, 07:48 AM   #33
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I know that driving style/speed has lots to do with mileage, and as an example I typically don't slow down even with a head wind, and in such cases usually get as low as 10.5 MPG towing into a head wind and driving 65. I know I am too impatient, but old habits are hard to change.
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Old 01-24-2013, 08:12 AM   #34
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10.5 MPG is right about in line with other 6.7L Cummins owners are seeing pulling a trailer the size of your 31'. Slowing down may gain you little, but you are definately in the ballpark.
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Old 01-24-2013, 08:35 AM   #35
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10.5 MPG is right about in line with other 6.7L Cummins owners are seeing pulling a trailer the size of your 31'. Slowing down may gain you little, but you are definately in the ballpark.
My mileage statement above was with my '08 Duramax....I just recently traded for the Ram, and have no towing history/mileage data on it to date.

Just wanted to clear that up.
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Old 01-24-2013, 09:14 AM   #36
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My mileage statement above was with my '08 Duramax....I just recently traded for the Ram, and have no towing history/mileage data on it to date.

Just wanted to clear that up.

Sorry for the misundertanding.
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Old 01-24-2013, 04:00 PM   #37
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I get 8.5-9.2 depending on terrain and wind with my 2008 F250 V-10 towing my 30 Classic W/SO plus all my other crapolla in the bed.

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Old 01-24-2013, 05:32 PM   #38
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I get 15.7 mpg with my 2007 Duramax towing my 2007 Classic Ltd 30' at 65 mph.
On the highway running 75 mph (not towing) 21-22 mpg.
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Old 01-24-2013, 07:32 PM   #39
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Diesel MPG and service costs

Hi:

Just went out and checked our last oil change/service on our 2011 GMC Sierra Denali crew-cab 1-ton (SRW) pickup. Last oil change was in June 2012 at 11K miles at Reliable GMC/Buick/Cadillac in Roseville, CA. Total cost of oil, filter, labor, CA disposal fee and tax was $109.32. That also includes checking for any recalls, firmware and software updates and a 33 point safety inspection. I consider that a reasonable cost as they give me a car to take home or will take me home and pick me up.

As for MPG, towing our 2004 30 ft. Classic trailer we are close to 15 MPG with only 15K miles on the truck. I would assume the MPG will increase as time goes on. Not towing, we get 20 MPG. As example a trip from Roseville to Upland, CA then to San Diego and back to Upland. I had 660 miles on the tank (reserve light came at about 620 miles) I consumed 33.5 gallons meaning I still had 4.5 gallons left in the tank. Some of this driving was during L.A. traffic on the 210 through Pasadena.

To compare this truck to our last truck which was a 2002 GMC 3/4 ton Yukon XL with the 8.1 litre gas engine and 4:10 rear end. We went from Roseville, CA to Bridgeport, CA near Mono Lake. As we got to Bridgeport the reserve light came on with the Yukon, meaning about 8 MPG. With the Denali, same trailer and road we still had 1/2 tank left when arriving in Bridgeport, so double the MPG with the diesel. Both trucks have a 38 gallon tank.
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