Other than the introduction of the XUV, not much changed for the GMC Envoy midsize SUV in 2004. This model comes in 4 trims: SLE 2WD, SLE 4WD, SLT 2WD, and SLT 4WD. All 4 trims use a 4.2 L, 275 hp I6 engine with 4 speed automatic transmission. As for gas mileage, expect 15-16 mpg in the city and 21 mpg on the highway. All trims have 4 doors, seat 5, and offer an extensive list of standard and optional features. The SLT gives you more than the SLE with standard power and leather seats with optional navigation system. The 2WD versions of the SLE and SLT give you optional traction control. Finally, when it comes to towing capacity, the Envoy can lug a maximum of 6100-6300 lbs. Overall, drivers give the 2004 GMC Envoy a solid grade with a couple caveats. While the options and I6 engine get props from Envoy fans, better steering and handling would make this SUV better able to compete with the other vehicles in its class. Look for a V8 engine in 2005 as the Envoy continues its evolution.