The Yukon XL SLE 2WD ($41,490) and 4WD ($44,330) and the better-equipped SLT 2WD ($46,030) and 4WD ($48,765) come standard with a 5.3-liter V8.   A 6.2-liter V8 is optional ($1,000).  

The Yukon XL 2500 SLE 2WD ($43,110), SLE 4WD ($45,950), SLT 2WD ($47,510), and SLT 4WD ($50,355) come only with a 352-hp 6.0-liter V8 with 382 pound-feet of torque, a six-speed automatic, and rear or 4WD.  

SLE1 standard equipment includes cloth upholstery; dual-zone manual climate control; auxiliary rear AC; AM/FM/CD/MP3/XM six-speaker stereo; Bluetooth; cruise control; OnStar Safe & Sound with one year subscription; driver information center; power windows/locks/heated mirrors with manual folding; leather-wrapped, tilt steering wheel with audio controls; 40/20/40 split front bench seat; six-way power driver's seat; 60/40 split folding second-row bench seat; 50/50 third-row split folding seat; automatic headlights; roof rails; side steps; locking rear differential; three power outlets; P265/70R17 all-season tires on bright aluminum wheels; tow package (receiver hitch, seven-pin wiring harness); intermittent rear wipe/wash; and floor mats.   4WD models also get an aluminum-block engine, 3.42:1 axle ratio, and front tow hooks.   Options for Yukon XL SLE1 are a Convenience package ($1060) with adjustable pedals, remote start, rear park assist, rearview camera; fog lamps; tow hooks; CD changer ($295); integrated trailer brake controller ($200); Z71 off-road package ($230); two-speed transfer case ($100); 20-inch wheel packages; rear-seat entertainment ($1295); and towing package ($230).   SLE2 adds three-zone climate control, rear audio controls with headphone jacks (you supply headphones), power front bucket seats and center console, and Bose sound system.  

SLT1 models add three-zone automatic climate control, Bose audio system, auto-dimming inside mirror, rear park assist, remote start, adjustable pedals, and universal remote.   SLT options include Autoride suspension with rear self-leveling ($1120), the 6.2-liter engine ($1000) and second-row bucket seats ($590).  

SLT2 adds leather upholstery (vinyl third row), more adjustable front seats and driver memory, power liftgate, heated front and second row seats, and power folding mirrors w/signals and parking tilt-down.   Options include the Sun Entertainment Destination package ($4890) with navigation, rear-seat entertainment, and moonroof; third-row screen ($600); power side steps ($1095); Preferred package ($675) with rain-sensing front wipers and power liftgate; 20 or 22-inch wheels; rearview camera in mirror ($450); heated/cooled front seats ($650); Blind Zone Alert ($500); and power release second-row bench ($425).  

Denali ($55,665) and Denali AWD ($58,750) come with a 6.2-liter V8 and Autoride active electronic suspension with rear load-leveling.   Denali models come fully loaded, with a wood and leather-wrapped, heated, power-tilt steering wheel; heated first- and second-row seats; 12-way power front seats with lumbar adjustment; memory for the driver's seat and mirrors; power-folding second-row seats; removable three-passenger split-folding third-row seat; power-folding exterior mirrors with integrated turn signals, driver's side auto-dimming and reverse tilting; rain-sensing wipers with heated washers; power liftgate; roof rack, Bluetooth; 10-speaker Premium Bose Centerpoint Surround Sound System; added noise insulation and cooling capacity; and 20-inch wheels and tires (18-inch wheels are available for a $995 credit, for poor roads, tire chains, etc.).  

Options are limited to those in the Sun, Entertainment and Destinations Package ($2,390) or separately.   Among them: rear entertainment ($1295), third-row screen ($600); power side steps ($1,095); 22-inch wheels ($2795); and Side Blind Zone Alert ($500).  

Safety equipment on all models includes dual frontal airbags, head-protecting curtain side airbags, four-wheel-disc anti-lock brakes with electronic proportioning, and StabiliTrak, GM's electronic stability control with anti-rollover mitigation and traction control.   Options include rear park assist, two rearview camera choices, and on Denali, Side Blind Zone Alert.   Side airbags are not available.   The XL earned the maximum five stars in the government's head-on crash tests.   Optional all-wheel drive enhances safety in foul weather.