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The CLA will have a drag co efficient of 0.23 and the 180 CDI Blue will be even lower at 0.22

Typical drag coefficients

The average modern automobile achieves a drag coefficient of between 0.30 and 0.35. SUVs, with their typically boxy shapes, typically achieve a Cd of 0.35–0.45. A very gently inclined windshield gives a lower drag coefficient but has safety disadvantages, including reduced driver visibility. Certain cars can achieve figures of 0.25–0.30, although sometimes designers deliberately increase drag to reduce lift.
Some examples of Cd follow. Figures given are generally for the basic model. Some "high performance" models may actually have higher drag, due to wider tires and extra spoilers.

For a list or cars and their drag coefficents
Automobile drag coefficient - Wikipedia, the free encyclopedia
 

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Not only is it close to as aerodynamic as a 1961 Panhard CD, it looks good too!
 

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Look at the photo I found

A mercedes benz CLA in the wind tunnel
Awesome picture of the CLA. The way they built the CLA contribute to the Blue Efficiency standard they follow. More manufacturers should look in to doing things like this. Building and designing without have to make sacrifices because of looks and function without sacrifice.
 
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