The 2011 Chevrolet Tahoe Hybrid is no doubt the star of the lineup from a green perspective; with an EPA-estimated 20 mpg city, 23 highway, it goes nearly 50 percent farther per gallon on regular gasoline than most full-size utes, and it has comparable performance and towing and hauling ability.
But even the standard Tahoe and Suburban models are significantly better on gas than other models in this class. For instance, the Nissan Armada 4WD gets just 12/18, while the equivalent Tahoe gets 15/21.
All standard Tahoe models are also E85 (85-percent ethanol) compatible; but when you fuel up with ethanol you'll get an EPA-estimated 11 mpg city, 16 highway.
The 2011 Chevrolet Tahoe models aren't particularly greeen—but the Hybrid is one of the most fuel-efficient large SUVs.