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Hybrid Vehicles Chevrolet Tahoe and GMC Yukon Hybrid Article Comments - 2008 Chevrolet Tahoe First Drive and Follow-Up Test
62 messages, Last post on Jun 05, 2008 at 3:32 PM
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Article comments for First Drive: 2008 Chevrolet Tahoe Two-Mode Hybrid - Two-mode hybrids aren't exactly new. GM has had the two-mode hybrid system working in transit buses since 2003. Today, about 700 of those buses are operating in 60 cities in North America and have just been introduced in Europe. (more)
Follow-Up Test: 2008 Chevrolet Tahoe Hybrid - Bottom Line: It's better, but whether it's $9,100 better is up to you. (more)
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Well since we've been given no numbers, we'll have to assume. Being realistic... The 2007 Tahoe fuel economy numbers are 15 City and 21 Highway. The 2008 numbers are calculated with more realistic testing procedures. The 2008 Tahoe gets 14 City and 19 Hwy. A 25% increase equals: 17.5 City and 23.75 Hwy (although the electric motor is used infrequently on the highway and I doubt 23 will be the norm) How many $1000s will this cost us? |
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If they can do a gasoline hybrid, why not a diesel one. Also, they should be doing this hybrid technology on all their smaller cars or better, all of their cars...I can only imagine the MPG on a diesel one.
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The article states 25% better fuel economy. The current 6.2L Yukon XL is rated at 13/19 So, if that's an average, and hybrids do better in city than highway, it should get 17 city and 22 highway, or thereabouts. Not stellar mileage, but given the size and capability of the vehicle it's pretty good. To note: You save as much gas per year raising your mileage from 13 to 17, as you do going from 24mpg to 42mpg (about 215 gallons for 12K miles) |
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Replying to: KarenS (May 11, 2007 6:05 am) Someone should point them to the Edmunds "hybrid questions for newbies" to learn the facts. BWM and GM have just re-invented the system that the Prius uses. The techniques may be different in implementation, but the concept and actual useage have been around for 7 years. Hmm, 7 years, that is about right for an American auto company to finally catch up with the Japanese.
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Replying to: easym1 (May 11, 2007 10:06 am) Two reasons: 1. Diesels already give good MPG, and their torque comes at low RPM. This means the electric motor would not be as beneficial. 2. Diesels cannot be sold in a number of states. This situation will continue until CARB approves a "clean burn" diesel. Current designs require regular (50K) maintenance to ensure the vehicle meets particulate requirements, and so far CARB has been unwilling to bet that owners will have the service done. Honda is working on a design for 2009-2010 on an engine that does not need service at 50K. The concept has been announced, but not for any specific vehicle. They also said they would license the technology freely. |
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Diesel engines get their effentcy with high pressure and heat. Loss of heat is disasterous for a diesel. That is why there are no Diesel hybrids. Two Mode Hybrid is significantly different from the Toyota System. It is more flexible and will have greater applications on the vehicle that need Hybrid Technology the most. Toyota's is not meant for anything heavy duty. So belly ache all you want about Toyota. They don't have this yet.
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Replying to: stevedebi (May 11, 2007 10:49 am) Also, I think hybrid technology was developed in the United States during the 70s by independent engineers and professors, not by Toyota (as they'd have most American consumers believe). Toyota may have perfected it in the 90s and got it out on the roads quicker than GM, but it certainly wasn't something they came up with first.
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Replying to: brett8210 (May 11, 2007 6:31 pm) Diesel would only be real effective in a hybrid system it if was a full plug-in hybrid system, i.e. the electric motors run the vehicle 100% of the time and the combustion engine is only used to generate electricity to recharge the batteries. In this type of hybrid the combustion engine can operate at peak efficiency whenever it is running and diesel would have more of an advantage. Of course, we will most likely not see these types of hybrids until we have better battery (or capacitor) technology available because they tend to need to store more energy. Oh and for Toyota-freak above, this dual mode hybrid system is a vast improvement over the one that Toyota currently offers. This is what competition is all about. |
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Replying to: ledfoot1 (May 12, 2007 1:01 pm)  I'm a bit disappointed at GM for making the dual hybrid expensive and making these SUVs as a "rich man's green mobile". It should be affordable to all. This is where the goverment should step in and pass legeslation for substancial tax breaks. So far our goverment has done little so far on this.  This new H-Yukon is nice and so far its in the top my list for a new vehicle at the end of the year. We'll see, price will play s role on this. They better be dealing!!! 
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The 2008 VW Jetta will have a clean diesel that requires no special maintenance or additives of any sort. It is certified for sale in all 50 states, you can bet there will be a line of people at the VW dealers in CA. It will be available 1 or 2 years before Honda's and everyone elses. So apparently Honda doesn't have a monopoly on new technology...maybe they are actually licensing the VW technology! Anyways, the point is that tech wise the Japanese companies aren't always first or best...but unfortunately everyone's been brainwashed to think that way. I for one am impressed with GM's new 2 mode hybrid system. In the long run I'm sure we'll eventually see plug-in diesel hybrids running on domestically grown biofuels getting some ridiculously high mpg that makes all this look like the stone ages. Until then, this is real progress by a domestic company, and as an American citizen I can be happy with that! 
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