For 2009, GMC Yukon XL standard features include a 6-speed automatic transmission, Bluetooth connectivity, XM Real Time Traffic system and more new wheel options. Most Yukon XLs come standard with a 5.3L V8 that boasts 310 hp and 335 lb-ft of torque. Optional for the 1500 SLT is a 6.0L V8 that exudes 366 hp and 376 lb-ft of torque. All 1500 engines are paired with a new 6-speed automatic transmission. Yukon 2500 models come with a 6.0L V8 rated at 352 hp and 382 lb-ft of torque, paired to a 6-speed automatic geared for enhanced towing capability. Fuel-mileage ratings stand at 14 mpg city/20 mpg hwy and 16 mpg combined for the Yukon with the 5.3L V8 2WD power train. As for safety features, stability control with a rollover sensor is standard on the Yukon XL, as are antilock disc brakes, side curtain airbags and OnStar. With an up-to-nine passenger seating capacity, the Yukon XL is about as full-size and heavy-duty as you can get in a large SUV, with all of the towing and cargo capacity most families would ever need.