Based on the popular GMT-800 full-sized pickup, known to consumers as the Chevy Silverado and GMC Sierra, GM’s parallel hybrid pickup truck features a 5.3-liter VORTEC V-8 engine, the same as the conventional versions of the truck. The hybrid propulsion package will be available as an option on GM’s full-sized pickups beginning in 2004. Pricing is still being determined, although it is expected to be competitive. This fuel-efficient, full-powered pickup fits with GM’s strategy of introducing hybrid propulsion in large market segments and in vehicles that use more gas. Instead of a conventional starter motor and alternator, the parallel hybrid truck features an electric motor that is integrated into the drivetrain between the engine and the transmission. This provides starting power and the ability to generate electricity and saves weight and parts. The 4.8 kilowatts of electricity generated by the system has plenty of potential uses: it may be stored in a 42-volt battery pack, used to support on-board electric accessories, or employed to operate power tools off the pair of 110-volt, 20-amp outlets in the cab and bed. GM has chosen to go with advanced lead-acid batteries to keep the size and cost of the 250 pound battery pack reasonable. As more 42-volt systems and by-wire controls become available, this architecture can accommodate them. These 42-volt subsystems also tend to be smaller and lighter than their 12-volt counterparts, which will further improve fuel efficiency. The parallel hybrid truck’s power steering is run by an electrically driven hydraulic pump rather than the traditional belt-drive system. This innovation saves weight and parts. Similarly, the heating system is supplemented by an electric pump that keeps hot water circulating even when the engine is off. In cold weather, this innovation will save considerable fuel. At a stoplight, the gasoline engine actually stops running, but most of the accessories continue working on stored electrical power. When the light turns green and the driver steps on the accelerator, the gasoline engine kicks in again. The truck gets more out of each gallon of gas because of the engine start/stop function and regenerative braking, which turns the motor into a generator as the truck decelerates.