Hyundai's first hybrid in the U.S. market features a proprietary parallel hybrid drive system called "Hybrid Blue Drive" that utilizes a 169HP 2.4-liter Theta II (operating on an Atkinson Cycle) linked to a 6-speed automatic transmission (and not a CVT as most Hybrids), a 30kW (151 lb-ft) electric motor and a lithium polymer battery pack located in the forward portion of the trunk.
2011 The Hyundai Sonata Hybrid