This document provides information on the 2010 GMC Sierra, including its hybrid and non-hybrid powertrain options. The Sierra Hybrid uses a 6.0L V8 engine combined with electric motors and batteries to provide 332 horsepower and an EPA estimated 21 mpg in the city. It can tow up to 6,100 pounds. Non-hybrid models include the Sierra XFE which uses active fuel management to improve fuel economy from the 5.3L V8 engine. Higher trims like the Denali include more powerful 6.2L V8 engines. The document discusses the Sierra's capabilities for towing, payload, and off-road use.