2008 GMC Yukon Hybrid

The GMC Yukon's hybrid package is a twin to the Chevrolet Tahoe Hybrid, and they're both expected to deliver a 25 percent improvement in overall gas mileage over conventional models (which get up to 22 mpg on the highway). The Yukon's V-8 engine is mated to two electric motors inside the transmission, one of which powers the Yukon Hybrid for city driving; the other kicks in for highway cruising.