The biggest update you'll notice in the 2005 GMC Envoy comes in the form of the 2WD and 4WD Denali trims, which bumps the total trim number to 6. The new Denali sports a 5.3 L, 300 hp V8 powertrain with 4 speed automatic transmission, a noticeable power boost from the 4.2 L, 275 hp I6 found in the 2WD and 4WD SLE and SLT trims. In addition to a more powerful engine, the Denali has some fancy exterior accents that include a chrome grille, redesigned fascia, and 17 inch wheels. As for other specs, the 2005 GMC Envoy generally gets 15 mpg in the city and 20 on the highway. This midsize SUV has 4 doors, seats 5, and offers a solid list of interior features that include standard ABS brakes, power windows, and power door locks. Towing capacity on this midsize SUV can range from 5100 to 6700 lbs. Overall, drivers have same mixed feelings about the Envoy that they've always had. While many of them like the solid list of features and capable engine choices, they'd appreciate better steering and handling. The 2005 GMC Envoy represents a solid domestic SUV that looks to improve over the next few years as the model evolves. However, you can do better if you do your homework.