This week's car segment talks about active noise control (or noise cancellation) in today's automobiles. Sam says that Active noise cancellation in cars is similar to that in headphones, which uses noise cancellation to dampen out ambient noise. It was first used in 1993 in Audis. Sam also says that active noise control can help your fuel economy as well. It enables you to drop minimum engine speed at idle to 600 RPM, giving you an extra 1 MPG. It's also being used in hybrids for the same reasons. That technology is also being used to enhance sounds to make the car sound more sporty and powerful.