The 2015 GMC Sierra 1500 SLT with the 5.3L EcoTec3 V8 engine and 6-speed automatic transmission delivers a strong balance of power, comfort, and utility. Producing 355 horsepower and 383 lb-ft of torque, this truck offers impressive towing capabilities of up to 11,200 pounds when properly equipped. Available in rear-wheel or four-wheel drive, it features a fuel-efficient design for its class, achieving up to 23 mpg on the highway. The SLT trim adds upscale touches like leather-appointed heated power seats, dual-zone automatic climate control, and an 8-inch IntelliLink touchscreen with available navigation and Bose audio. Exterior highlights include chrome accents, projector-beam headlights with LED signature lighting, and available 20-inch wheels. Safety and convenience features include a rearview camera, optional driver-assist technologies like lane departure warning and forward collision alert, as well as remote start and power-adjustable pedals. Whether for daily driving or heavy-duty work, the 2015 Sierra SLT offers a refined yet rugged full-size truck experience.