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TDI cars in the U.S. came with that as a sound damper under the engine but I believe it helps with aerodynamics as well. The radiators and engine bay are turbulent, drag inducing areas. Many Ecomodders have started with an engine cover as the first steps in developing a belly pan, or just used them on their own.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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