2011 Bentley Mulsanne (photos)

The twin turbo 6.75-liter engine under the hood produces 505 horsepower. But the more important number for a luxury sedan such as this is its 752 pound-feet of torque, available at 1,800rpm, ensuring that the big vehicle moves effortlessly and smoothly forward on command. The engine is mated to an 8 speed automatic transmission.