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The Tahoe/Yukon Hybrid is pretty cool technology. The could/should do 20 mpg city and 25 mpg freeway in 2008 testing, but haven't had EPA certification yet. There will be more two-mode hybrids to come, even with diesels at some point in the not-too-distant future.
GM has stated publicly that two-mode technology should retail for about $10K but are planning to subsidize that difference. Figure a $4K premium over a 5.3L version. That should put hybrid payback in the three year range for the average driver.
The 6.0L V8 in the two-mode should prove to be a considerably better tow rig than a 5.3L and the electric motors can help as well. The ~6000 pound tow rating is hindered by the low-rolling resistance tires and some other small changes, not how 'strong' the powertrain is.
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-Eric
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