With two engines and both 2WD and 4WD variants available, the GMC Yukon offers a range of efficiency and capability, though it loses the hybrid version of the previous generation.
The standard 5.3-liter V-8 engine in a 2WD model rates as high as 23 mpg highway and 18 mpg combined, a figure brought down somewhat by its 16 mpg city rating. At the other end of the spectrum, the 4WD Yukon Denali XL with the 6.2-liter V-8 engine rates 14 mpg city, 20 mpg highway, and 16 mpg combined. The rest of the available variations on the Yukon theme fit between these two bookends.
Whichever version of the Yukon you choose, you're paying a price at the pump for the passenger, cargo, and towing capacity offered by these substantial full-size SUVs. As many steps as GM has taken to improve the gas mileage of its new V-8 engine, including direct injection and cylinder deactivation, the reality of physics weighs in heavily--and these nearly 6,000-pound vehicles are heavy.