I haven't
If they do it, based on the gains in the Escalade, city EPA will probably improve by 30-50% and highway will improve by 20%.
Contrary to popular belief the larger and heavier a vehicle is the more attractive a hybrid solution is and the more it will save in gas (compared to a similar conventional powered vehicle). You won't get those headline popping numbers like "45 mpg", but going from 12 mpg in a normal suburban to a hybrid Suburban getting 18 mpg will save a lot more gas than a prius going from 30 to 45. That is why GM jumped into hybrids with their heavy SUVs first. That is where the most beifit is to be gained.
The hybrid Tahoe has exactly the same tow rating as the gas version, but in use it actually has an advantage over the gas model. The gas and electric Tahoes both have the same peak torque ratings but the 2 mode hybrid system used by GM uses an electronic torque converter in place of the normal hydraulic one. This offers an advantage for towing because the electric motor can produce maximum torque all the way to zero RPM (this is a characteristic of any electric motor). This gives the driver more torque initialy from a standing stop (like starting up a boat ramp for example) than is available on the conventional gas model. I would assume the hybrid Suburban, if they did it, would also be rated to tow the same amount.
Due to subsidies the hybrid Tahoe is only slightly more expensive than gas version (like $1000 or so more). Most people with enough money to buy one will probably save in the long run with the tax rebate they get for buying a hybrid. The only downside is the batteries. They will cost a lot to replace when they go bad (l've heard like $15,000), and like all batteries they will go bad eventually.
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