2006 Gmc envoy xl denali gas mileage Read Also: 2006 Gmc envoy denali gas mileage 2006 Gmc envoy xl gas mileage 2006 Gmc envoy slt gas mileage 2008 Gmc envoy denali gas mileage Gmc envoy xl 2006 gas mileage 2006 GMC Envoy XL Denali #9347223