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Old 07-15-2013, 10:12 AM   #1
Shoey
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Expected fuel mileage?

Currently I'm pulling my 255RKS with a 2005 GMC 2500 6.0 litter Gas motor.

I get about 9 mpg when towing and average 12.5 when I'm not towing.

I considering upgrading to a 2014 GMC 2500 Diesel Duramax. Anybody have and estimate of what I can expect for fuel mileage when towing and not towing.

Maybe from a 2013 model, yes I know it depends on driving style and weight etc, but I just looking for some ball park numbers before I make the upgrade.
I've heard numbers like 18 when not towing and 14 while towing. Are these accurate?

Thanks.
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Old 07-15-2013, 10:18 AM   #2
Festus2
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If you do a forum search - type in fuel mileage and you can browse through some of the previous discussions about what members get while towing and not towing with several different truck brands.

Does the manufacturer's website give any figures on mpg? Probably inflated but you did ask for a ballpark figure so you can subtract "x" from what the manufacturer claims.

It would be my guess that 14 mpg while towing is the exception rather than the rule - but as you said, there are so many factors that dictate what kind of mpg one can expect while driving.

Hope this helps.
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Old 07-15-2013, 05:01 PM   #3
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OK, real world numbers: 2011 Chevy 3500HD Dually, Duramax/Allison. Towing 17K plus 9 to 10.5, average about 9.5. When solo around town/stop-n-go about 14. On the open Highway solo 18 to 20 if you keep it under 70 (usually 62 to 65). So by all rights, a 2500 should do a little better since it's not turning the extra set of tires.
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Old 07-15-2013, 05:45 PM   #4
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Quote:
Originally Posted by Shoey View Post
Currently I'm pulling my 255RKS with a 2005 GMC 2500 6.0 litter Gas motor.

I get about 9 mpg when towing and average 12.5 when I'm not towing.

I considering upgrading to a 2014 GMC 2500 Diesel Duramax. Anybody have and estimate of what I can expect for fuel mileage when towing and not towing
.

I have a 2012 Chevy 2500 duramax I get about 17 around town and between 11 and 12 mph pulling my 5er.
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Old 07-16-2013, 05:04 AM   #5
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Thank you all for the replies. It sounds like 18 solo and 12 pulling my camper will be a little more realistic. It is still 30 to 50% better than I'm getting with the gas motor.
It easily overcomes the additional cost of the fuel. ....and the extra power/torque doesn't hurt either.....
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Old 07-16-2013, 08:16 AM   #6
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I have a 2wd diesel crew cab. This last fill-up I averaged 18.2 mpg(70% highway at 70 mph, 30% city and country road at about 55 mph average). I have no idea what I get when pulling the trailer, I haven't made a long enough trip yet to calculate it. There's a web site called fuelly.com that's worth checking out.
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Old 07-16-2013, 11:52 AM   #7
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Just pulled through the mountains in BC and got 13.35. Be about 11.5 in US mpg. That was from the Okanagan to the lower mainland so lots of hills at 110 km/h.

Coming home I stuck to 100 km/h but haven't fueled up yet so not sure what my mileage is.

My trailer is a big bigger and is about 8,000 lbs loaded. But I also don't have any emissions stuff on my truck (from the factory) and you'll have a cat, egr, dpf etc.
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Old 07-16-2013, 12:27 PM   #8
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GMcKenzie -

I would suspect that your mileage going home would be somewhat less than it was coming to the coast. After all, many of those "hills" that you spoke of are going down. People from the Interior and Okanagan always go "down to the Coast" while those of us who live on the coast always go "up to the Okanagan or the Interior".
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Old 07-18-2013, 01:57 PM   #9
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Originally Posted by Festus2 View Post
GMcKenzie -

I would suspect that your mileage going home would be somewhat less than it was coming to the coast. After all, many of those "hills" that you spoke of are going down. People from the Interior and Okanagan always go "down to the Coast" while those of us who live on the coast always go "up to the Okanagan or the Interior".
Yeah, but I was only doing 100 vs the 115-120 I did on the way down.

But I sure use more fuel doing 100 up the snowshed hill than I did doing 70-80 down.
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Old 07-19-2013, 08:05 PM   #10
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Quote:
Originally Posted by Shoey View Post
I considering upgrading to a 2014 GMC 2500 Diesel Duramax. Anybody have and estimate of what I can expect for fuel mileage when towing and not towing.
Thanks.
I have a 2012 2500 HD 4x4 CCSB. Empty I get in the high 19s to low 20s if I keep my speed 65 mph or less. Towing it does some strange stuff. I have a little 17' TT that weighs around 4K lbs and I average 15 MPGs pulling it. I had a 30' TT that weighed around 7850 lbs loaded and I only got between 10 and 11 MPGs pulling it. I now have a 5th/W that weighs 3550 lbs more at 11350 lbs and I average 12 MPGs pulling it over the same roads at the same speeds. Not sure what's going on here but I like pulling the 5th/W much better.
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