Recent Arrival! CARFAX One-Owner. Vortec 4.8L V8 SFI VVT Flex Fuel, 4-Speed Automatic with Overdrive, Ebony w/Premium Cloth Seat Trim. Storm Gray Metallic 2011 GMC Sierra 1500 SL RWD Vortec 4.8L V8 SFI VVT Flex Fuel 4-Speed Automatic with Overdrive Awards: * JD Power Dependability Study Reviews: * Smooth, quiet ride, comfortable seats, powerful V8 options, comprehensive safety equipment. Source: Edmunds * If you need a pickup truck for work or pleasure and want to limit costly fill-ups, the 2011 GMC Sierra Hybrid is ready to serve. It remains the most efficient full-size truck on the road. Source: