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 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. The Yukon Hybrid is offered in a Base and a Denali trim. Safety features standard on all models include dual-stage front airbags, side curtain airbags, seat-mounted side airbags, four-wheel anti-lock brakes with dynamic rear proportioning, Stabilitrak stability control system with rollover mitigation, tire pressure monitoring system, and OnStar. For 2011, the GMC Yukon Hybrid receives the new paint color mocha steel metallic.