In the year before a major redesign, not much changed for the GMC Yukon SUV. The '06 Yukon has 5 trims: the SL, SL 4WD, SLE, SLE 4WD, and Denali AWD. You'll get your choice of 3 powertrains: a 4.8 L, 285 hp V8, 5.4 L, 295 hp V8, and 6.0 L, 335 hp V8. Gas mileage across trims comes out to around 15 mpg in the city and 19 on the highway. SL's have 4 doors and seat 6 while the SLE's seat 9 and offer optional sunroof and navigation system. With second row seats folded and third row removed, cargo capacity reaches 105 cubic feet. SL's and SLE's have max towing capacity of 7700 lbs. while the Denali AWD tows up to 8100 lbs. Overall, drivers like the roomy interior and powerful V8 powertrains. However, they also say that the Yukon needs better materials. Despite the shortcomings, the 2006 GMC Yukon delivers in just about every facet. Go for an '07 if you want something even more modern.