A full-size truck that offers hybrid capability? What a great idea for a vehicle segment where per gallon fuel economy is usually in the low teens. The GMC Sierra now offers a half-ton pick-up truck in a hybrid configuration. That’s accomplished by using an integrated starter alternator damper (ISAD) made by a supplier company. The ISAD replaces a conventional starter, generator and flywheel with an electronically controlled unit. And that unit provides 12- and 42-volt electrical power as well as active damping of powertrain and driveline. Put another way, the ISAD helps boost fuel economy by 10 percent or more versus the gasoline-only counterparts. Sierra Hybrid employs a 5.3-liter V8. And for those wondering, the hybrid functions do not interfere with the vehicle’s performance – meaning the V8 still produces 295 horsepower and 335 pounds-feet of peak torque. While the engine shuts off during stops, the accelerator reaction is immediate, meaning there’s no discernible lag. Sierra Hybrid with extended cab provides a roomy back seat (with two headrests) that is accessed via wide opening rear doors. Sierra has a good amount of interior stow space. Mile per gallon estimates for Sierra 1500 four-wheel-drive with automatic transmission are 17 city/19 highway. MSRP is $31,700.