GMC Yukon/Yukon XL (NEW FOR 2007!)

Impressions: As GMC's mates for the Chevrolet Tahoe and larger Suburban — which are completely redesigned to be tougher, sleeker and more fuel efficient for 2007 — the Yukon and extended-length XL pop out of a new mold that has these two full-size people movers looking stronger and far more contemporary than their predecessors. As has always been the case, variety is the key: the Yukon is available in two- or four-wheel drive, 1/2- or 3/4-ton chassis strengths and with a bevy of engines ranging from a 295-horsepower 4.8-liter V8 in base rear-wheel-drive Yukon models to an optional 366-horsepower 6.0-liter V8 that uses variable cam timing. In between are several variations of the venerable 5.3-liter V8 with either aluminum- or cast-iron-block construction and the ability to run on E85, a mixture of 85 percent ethanol and 15 percent gasoline. The 5.3 employs cylinder deactivation, which cuts the fuel to half the engine's cylinders in light-throttle and cruise situations to help save fuel. While that's all well and good, it just might be inside where the biggest and best difference is noticed. There, you'll find a much improved layout, better functionality and a higher grade of materials used. Even the ride is quieter, but a lot of the improvement, according to sources at GM, has to do with an improved (stiffer and stronger) frame/chassis. Beyond this, the biggest difference, quite literally, between the Yukon and Yukon XL is the 20 extra inches of length and 14 extra inches of wheelbase (the distance between the front and rear wheels) tacked on to the XL. Although both vehicles can hold up to nine people, the XL's extra space is completely dedicated to cargo room forward of the rear bumper. Both regular- and extended-length models come in SLE and up-level SLT trim levels with a wide assortment of gear specific to each package. Base models include the usual power package (windows/locks and mirrors) as well as air conditioning, anti-lock brakes and stability control with "roll-mitigation" software to help keep these big GMCs shiny side up at all times. Base price: $34,200, $37,300 (XL) Type: Four-door, full-sized sport-utility vehicle Base engine (hp): 4.8-liter OHV V8 (295) Optional engines (hp): 5.3-liter OHV V8 (310/320); 6.0-liter OHV V8 (352/366) Layout: Front-engine, rear-/four-wheel drive Transmission: Four-speed automatic Mileage (city/hwy): 15/20 (4.8); 16/22 (5.3, 4x2) Safety: Front airbags; side-curtain airbags (opt.); anti-lock brakes; stability control Weight (lb.): 5,420 Basic warranty: 3/36,000 Roadside assistance: Yes Web: gmc.com