2008 GMC Yukon XL

Extended Run

The stretched-out GMC Yukon XL can tow and haul with aplomb, and makes a capable people-mover with the ability to seat up to nine passengers.

Like the standard GMC Yukon, the extended-length Yukon XL benefits from the added refinement and power that it received during a recent redesign. However, there is still a price to pay in terms of fuel economy, making the Yukon XL best for those who really need its rugged abilities. It is especially capable for towing and hauling.

As before, it’s a close relative of the Chevrolet Suburban and the flashier, more luxurious Cadillac Escalade ESV.

The GMC Yukon XL comes in three trim levels — SLE, SLT, and the upscale Denali — in both rear- and four-wheel-drive versions.

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The previous generation’s 320-hp 5.2-liter V8 engine lives on in the current Yukon XL, but it now includes GM’s Active Fuel Management technology, in which half of the engine’s cylinders deactivate during low-load driving. Fuel economy on the rear-wheel-drive Yukon XL is 15 mpg city/21 mpg highway, and 15 mpg city/20 mpg highway for those with four-wheel drive. These results are several mpg better than previous versions of the Yukon XL, and on par with some V6-powered midsize models.

Heavy-duty 2500 models offer a 352-hp 6.0-liter V8 that produces 383 pound-feet of torque for extreme towing and hauling duties. A 6.0-liter V8 is also available, making 366 hp and 380 pound-feet of torque.

The upscale Denali version comes powered by a new 6.2-liter V8 that generates an impressive 380 hp and 417 pound-feet of torque for quicker acceleration and even better hauling abilities.

While the 5.3- and 6.0-liter engines remain saddled with a four-speed automatic transmission, the Denali includes a six-speed automatic that is far more advanced. This transmission includes two overdrive gears to help maximize the vehicle’s performance and fuel economy, although this powertrain is still the least fuel efficient of those offered in the Yukon XL.

The GMC Yukon XL rides on a chassis with a fully boxed frame that’s stiffer for added refinement with less noise, vibration, and harshness  than in previous versions. A wider track and a lower center of gravity contribute to better on-road stability, while a revised suspension provides a compliant ride and more precise handling.

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The Denali comes with the otherwise optional Autoride suspension in which electronically controlled shock absorbers make adjustments according to changing road and driving conditions to help maintain a smooth ride. Stability control is standard across the line; it now incorporates rollover mitigation technology that can deploy the vehicle’s head-curtain airbags before a crash occurs if it determines a rollover is imminent.

• GMC Yukon XL Vehicle Summary

A two-tone interior is crafted with high-quality materials. Redesigned seats offer a greater range of adjustment to accommodate long-legged riders in the front or second row. The instrument panel is positioned lower for easier visibility, particularly for shorter drivers.

A two-person third-row seat is standard, and one that fits three occupants is optional. Depending on the seating configuration ordered, the GMC Yukon XL can accommodate as many as nine passengers — this would require ordering the front bench seat as well. With the second row folded flat and the third row removed, the vehicle boasts a truly mammoth maximum cargo capacity of 137.4 cubic feet. The fact that the third-row seating doesn't fold into the floor and must be removed is unfortunate, likely a function of the robust, bulky frame and mechanical components below the rear floor.

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The GMC Yukon XL is well-equipped in all versions. The top Denali model adds amenities like a power liftgate, power-release second-row fold-and-tumble seating, power-adjustable pedals, rain-sensing wipers, remote start, rearview camera system, and a premium Bose audio system with XM Satellite Radio capability.