GM's advanced 2-mode hybrid system conserves energy by using an electrically variable transmission, a 300-volt storage system and a 332-hp 6.0L Vortec V8 engine with Active Fuel Management. The Tahoe Hybrid is able to accelerate using only the electric motor. The nickel-metal hydride (NiMH) battery includes an 8 year/100,000 mile warranty. Efficiency is also aided by a liftgate and hood made of aluminum, improved aerodynamics, low-rolling resistance tires, and a 0.4-inch lower ride height. For 2010, the Chevrolet Tahoe Hybrid receives upgraded audio systems including the addition of a standard USB port.