Drag coefficient (Cd) is a measure of an object's resistance to the flow of air around it. It is defined as the ratio of the drag force acting on an object to the dynamic pressure of the fluid flowing around it. The lower the drag coefficient, the less resistance the object experiences when moving through the air.
The drag coefficient of a car is an important factor in determining its fuel efficiency. A lower drag coefficient means that the car experiences less resistance when moving through the air, which in turn reduces the amount of energy required to propel the car forward. As a result, cars with lower drag coefficients tend to be more fuel-efficient than cars with higher drag coefficients.
The drag coefficient of the 2012 Audi S5 is 0.30, which is a relatively good figure. This means that the car experiences relatively little resistance when moving through the air, which contributes to its good fuel efficiency.
