GMC Envoy is considered a mid-size SUV, about the same size as a Ford Explorer. It's smaller than a GMC Yukon, but much bigger than the old GMC Jimmy. The Envoy's seat cushions are longer, wider and thicker than those in the TrailBlazer, and offer noticeably more side bolstering. Instrumentation is complete and clean. GMC Envoy is responsive and stable. The six-cylinder Vortex 4200 engine is exceptional and a perfect companion for the Envoy. Envoy feels smooth and stable at high speeds. It rides smooth and car-like at lower speeds without being overly soft in corners. GMC Envoy is an excellent choice among mid-size sport-utilities. GMC's brilliant inline six-cylinder engine gives up nothing to the Ford Explorer's available V8. It's well engineered and enjoyable to drive, stable and responsive.