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Chevy Tahoe/GMC Yukon Hybrid

301 messages,  Last post on Nov 23, 2009 at 10:58 AM

You are in the Chevrolet Tahoe and GMC Yukon Hybrid Forum. Your Host is pf_flyer

What is this discussion about? Chevrolet Tahoe Hybrid, GMC Yukon Hybrid, Hybrid Cars, SUV


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#21 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [larsb] by chadx
Aug 04, 2007 (3:48 pm)
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Replying to: larsb (Aug 03, 2007 6:16 am)

Per GM, the main reason they chose the 6.0liter was due to the aluminum block. They already had it in their line-up and it weighed less than the heavy 5.3liter block so they used it, along with other features to lighten the vehicle to compensate for a portion of the extra weight of the batteries, etc.
 
It had little to do with towing. Besides, the 5.3 liter equipped vehicles already tow a lot, so no need for extra power to tow LESS weight (lower rating) even with the extra vehicle weight. No need for a 6.0liter besides weight savings.
 
6,000 is still quite good tow rating compared to the usual Tahoes mid 7,000 tow range. I will disagree that past hybrids are unable to tow. The Lexus RX400h is rated to tow 3,500 lbs (same as their 3.5liter V6 powered non-hybrid RX350) and that is with a 3.3liter V6. The Toyota Highlander hybrid also tows 3,500 with a 3.3 liter V6 (same as the non-hybrid's tow rating). That's plenty to tow a pretty decent boat, most enclosed motorcycle/snowmobile/utility trailers, and some small campers. And remember the those are small-midsized SUV and the non-hybrid don't tow a whole lot.
 
Engine size does little to impact the tow rating on Tahoe so they could use a much smaller engine and still tow reasonable loads. If someone towed a great deal, then a hybrid probably isn't a good choice for them anyway. Why handicap the majority of potential owners with a big engine and lower-than-possible mileage so the few that need to tow 6,000 (and feel they must still drive a hybrid) can do so?
#22 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [chadx] by larsb
Aug 06, 2007 (7:32 am)
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Replying to: chadx (Aug 04, 2007 3:48 pm)

Good information, but what I said was "IN PART" they chose that engine for towing. And that's true.
 
Sure, the other hybrids can tow with minimal success. But never has a "hybrid SUV" been rated for 6,000 pounds. GM is happy to have this "largest towing load" feather in their hat.
 
They are glad to tell potential buyers "tow your boat 30 times a year and STILL be driving a hybrid to help the environment."
 
Believe me, that was/is a factor.
#23 of 301
SOLD at LAST! by gagrice
Aug 07, 2007 (7:25 pm)
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After months on Craigslist I have found a buyer for my GMC Hybrid. I may miss it, then again I may not. I found a beater Ford Ranger for my truck duties and I can now buy the Diesel SUV that will be more what I need in a vehicle.
 
Oh, and I got my price. $7000 more than I was offered in trade. Car Dealers are so greedy. Still has less than 13k miles after 25 months. The guy has looked all over CA for the GM hybrid. Dealers told him they were sent to help out after Katrina. Probably why I have not seen any others. His wife's car, 2002 Prius....
#24 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [larsb] by chadx
Aug 16, 2007 (8:39 am)
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Replying to: larsb (Aug 06, 2007 7:32 am)

>>>larsb - Good information, but what I said was "IN PART" they chose that engine for towing. And that's true.
 
I'm still not sure why you claim the tow capacity had anything to do with the using the 6.0 liter engine. I've found no supporting documentation or articles where GM claims this. The ONLY reason ever stated was it was a lighter engine block.
 
And my point was that the standard 5.3 liter will tow 7,000 - 9,000 in various GM vehicles, so a larger engine is absolutely not needed to help this vehicle with tow capacity. Even their old 4.8 liter would tow that much, so this in one case where engine size does not correspond with tow capacity. Acceleration or acceleration with load perhaps, but not capacity. That is vehicle set-up.
#25 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [chadx] by larsb
Aug 16, 2007 (8:51 am)
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Replying to: chadx (Aug 16, 2007 8:39 am)

From the USA Today review of the Tahoe hybrid:
 
The 6-liter has nearly 4% more horsepower and 8% more torque than the 5.3-liter in gasoline-only Tahoes.
 
AND:
 
Key exception: Hybrids tow less. Rear-drive hybrid is rated to tow 6,000 pounds, vs. 7,500 pounds for gasoline version. Four-wheel-drive hybrid is rated to tow 6,200 pounds vs. 8,200 for gasoline.
 
My educated guess is that using the smaller 5.3 liter engine would have made for an even LARGER disparity between the hybrid and the non-hybrid in regard to tow ratings.
 
Do you think GM wanted a GREATER disparity, or a LESSER disparity?
#26 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [larsb] by gagrice
Aug 16, 2007 (12:09 pm)
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Replying to: larsb (Aug 16, 2007 8:51 am)

I think it is further evidence that hybrids do not belong in any vehicle you plan to tow with. The compromise is too great to make the slight gain in mileage worth the extra complexity. I guess GM will just join Toyota trying to look green when they are not.
 
You notice that Toyota did not follow through with the Tundra hybrid they promised.
#27 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [gagrice] by larsb
Aug 16, 2007 (12:20 pm)
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Replying to: gagrice (Aug 16, 2007 12:09 pm)

I can revise your statement to fit reality:
 
"Hybrids for towing substantial weight is a new phenomenon, first introduced by GM in the 2008 Tahoe/Yukon hybrids. Later hybrid generations will get better at it."
 
And Toyota is green - the number two behind Honda in most "green rating" studies.
 
And Toyota never "promised" a Tundra hybrid. They talked some about it, but never said, "we ARE DOING IT."
#28 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [larsb] by tpe
Aug 21, 2007 (8:57 am)
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Replying to: larsb (Aug 16, 2007 12:20 pm)

My understanding is that this 2008 GMC hybrid will use Li-ion batteries. That's interesting when you consider that Toyota states this type of battery is still a couple years away from being mature enough for use in hybrids. I think what they're really saying is that the particular Li-ion chemistry they're developing (LiNiCoAlO2) still has major obstacles to overcome. This is the type found in laptops and is the most susceptible to thermal runaway. GM has specifically stated that they don't want any of their battery developers to pursue this chemistry because they don't feel it's suitable for an EV or hybrid application.
#29 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [tpe] by larsb
Aug 21, 2007 (10:26 am)
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Replying to: tpe (Aug 21, 2007 8:57 am)

Where did you see that the GMC Yukon hybrid is using lithium batteries?
 
All the info I can find say GM's system uses NIMH.
#30 of 301
Re: High hp engine defeats the purpose of hybrid/good mileage [larsb] by tpe
Aug 21, 2007 (11:26 am)
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Replying to: larsb (Aug 21, 2007 10:26 am)

Where did you see that the GMC Yukon hybrid is using lithium batteries?

 
Here's my source (slide 3). In doing more research I think this might be incorrect and the Yukon does in fact use NiMH batteries.
 
yukon

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