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Old 03-07-2014, 03:04 PM   #29
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20 mpg towing? I am from Missouri, show me.
Talk to the Jeep CD diesel owners on this forum. Reportedly, 20mpg.

I get up to 15 out of my Ody.
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Old 03-07-2014, 03:32 PM   #30
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I've never been sure whether the MPG problem I have is due to my suburban or due to a lack of, how shall we say, skill in calculating MPGs compared to the Jeep guys.
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Old 03-07-2014, 04:05 PM   #31
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I am not sure what you mean by that - calculating the mpg with a modern vehicle is a simple as taking a quick glance at the dash, no?

The Suburbans deliver atrocious gas mileage, especially by today's standards and even compared to some of more modern trucks. I suspect that the availability of fuel efficient seven seaters with decent towing ability - MB, Dodge and Jeep come to mind - has helped hastening their demise.
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Old 03-07-2014, 04:23 PM   #32
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It's been my experience that the Sub (ESC and Yukon XL) gets pretty much the same mileage as it 1/2 ton PU counterpart with the same powertrain. I just don't get your "atrocious" statement. 18.5ish solo and 11ish towing my 30'er. GCW is right at 15,500 to 16,000, depending on toys loaded. Every pound has its cost.
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Old 03-07-2014, 05:26 PM   #33
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I am not sure what you mean by that - calculating the mpg with a modern vehicle is a simple as taking a quick glance at the dash, no?

The Suburbans deliver atrocious gas mileage, especially by today's standards and even compared to some of more modern trucks. I suspect that the availability of fuel efficient seven seaters with decent towing ability - MB, Dodge and Jeep come to mind - has helped hastening their demise.
Andy, if I am not mistaken you have a vintage Airstream. Those are narrower than modern Airstreams, hence yield better fuel economy for your TV. You won't get the same fuel economy towing a modern Airstream.

I agree that fuel economy of Suburban is not good. Makes a lot of sense to have a light duty diesel engine in those.
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Old 03-07-2014, 07:06 PM   #34
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Interesting reading the comments about European tongue weights. The Porche Cayenne which is the same rig as the Touareg shows a 616 tongue weight. 1,157 pounds with weight distribution according to Porsche of Delaware
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Old 03-07-2014, 08:20 PM   #35
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Andy, if I am not mistaken you have a vintage Airstream. Those are narrower than modern Airstreams, hence yield better fuel economy for your TV. You won't get the same fuel economy towing a modern Airstream.

.
I know a guy who owns a 60's Caravel, and a late-model 30-footer...pulled by the same vehicle, they get the same mpg. One weighs a fraction of the other, but they both poke the same hole in the air, and that's where the real work lies. (until you go slow up a steep mountain.) The vintage unit has a smaller profile, but not by that much.
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Old 03-07-2014, 08:35 PM   #36
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Apologies in advance for the complete ignorance here - but why not a 3/4 ton diesel Suburban? Is such a beast a reality?? I'm imagining the drivetrain I have in my truck living on a Suburban shell - that would be pretty darn cool!
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Old 03-07-2014, 09:00 PM   #37
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The Denali exhaust was stock. It sounds great (deep rich tone) around town but when loaded and pulling a grade it produces incredible in-cabin drone.

The transmission would short shift unless you really kept your foot in it. It always seemed to be hunting. Even in manual it would still try to upshift. It is really setup as a luxury cruiser not even remotely a tow vehicle. I would stick with an upgraded Suburban.

I think a lot of the issues with a non tow mode TV is all the manufactures are trying to get the last tiny bit of mileage rating. Even the new MB sedans have the forced Eco mode. Every time you get in it you now have to turn Eco mode off or it constantly shuts down and starts back up in stop and go traffic. The transmission is in 5th by the time you get 100 feet unless you bury the pedal. Mileage is trumping a decent driving experience on the latest models.


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2012fb, did you have an aftermarket exhaust installed on your Denali? Because you stated you wanted a GMC exhaust system installed.
I would very much want to know your experience with the 6 SPF auto not well suited for towing. What did you not like about it? I'd like to know because if it is not a good tow vehicle then when the time comes to sell our Tahoe I don't think the Denali would be my choice then. I really like what I see it photos. I hope they'll be out soon. The Yukon's look great and the interiors are fantastic
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Old 03-07-2014, 09:12 PM   #38
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The Touareg expressly prohibits the use of a WDH and is the same mechanics as used on the Cayenne. 1,157 pounds on either would rip an unreinforced hitch right off the back in no time. The dealer is dead wrong. Inquire with Andy at Can-Am RV for the truth. He reinforces Touareg, Cayenne and ML/GL every week.


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Interesting reading the comments about European tongue weights. The Porche Cayenne which is the same rig as the Touareg shows a 616 tongue weight. 1,157 pounds with weight distribution according to Porsche of Delaware
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Old 03-07-2014, 09:13 PM   #39
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Does anyone know if the transmissions are the same on all the suv's? I have the old 4 speed 4l65E and it works fine. I would think more speeds means more shifts? The Denalis horsepower rating on the 2015 model is 420 or so with 460 Foot pounds of torque. Sweet!
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Old 03-08-2014, 02:18 AM   #40
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Does anyone know if the transmissions are the same on all the suv's? I have the old 4 speed 4l65E and it works fine. I would think more speeds means more shifts? The Denalis horsepower rating on the 2015 model is 420 or so with 460 Foot pounds of torque. Sweet!

My understanding is that all the new 1/2 ton GM SUVs have the same 6speed transmission. The old 3/4 had the same heavy duty version found in the 3/4 ton Silverado gasser. And yes, the Denali's 460 lb. ft. of torque is pretty darn interesting.
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Old 03-08-2014, 07:39 AM   #41
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Apologies in advance for the complete ignorance here - but why not a 3/4 ton diesel Suburban? Is such a beast a reality?? I'm imagining the drivetrain I have in my truck living on a Suburban shell - that would be pretty darn cool!
For some reason(s) GM won't make that product. There was a diesel version a while back but nothing in recent years. The closest you'll come is a custom order DuraBurb - there is a separate thread for that discussion.
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Old 03-08-2014, 08:01 AM   #42
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Apologies in advance for the complete ignorance here - but why not a 3/4 ton diesel Suburban? Is such a beast a reality?? I'm imagining the drivetrain I have in my truck living on a Suburban shell - that would be pretty darn cool!
Duramax 6.6 won't fit in the SUVs without significant floorpan changes or lifting the body. A lift is not acceptable for an OEM due to center of gravity concerns. There was a 4.5L diesel prior to bankruptcy, but it was "shelved" due to financial reasons. I wonder if it could come back if America's appetite for diesel really takes off. Right now, there are no plans to bring it out. CAFE COULD possibly drive it though.
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