Electric power steering
This compact steering rack replaces the belt-driven hydraulic pump bolted to the front of the engine. Electric power steering can increase fuel efficiency by as much as six percent in some vehicles because no energy is consumed by the system until the driver turns the steering wheel. The old-style hydraulic pump uses energy even when the car is being driven in a straight line. Electric power steering is standard on nearly all small cars, including the Ford Mustang, pictured above.