ZF says the 8HP is six percent more *efficient than the outgoing sixer and
nearly as efficient as a dual-clutch automated manual, which ZF also produces. However, the eight-speed is roughly 20 percent cheaper and retains the smooth, torque-converter starts to which U.S. buyers have become accustomed. Furthermore, the 8HP has a system to maintain hydraulic pressure even when the engine isn’t running and is therefore the
first automatic that’s compatible with stop-start operation
http://www.caranddriver.com/features...sion-tech_dept