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Cd, I have a full belly pan under my diesel except for under the catalytic converter. I experimented with a sheet metal cover under that too. I didn’t see a mpg improvement but it really heated up the floor of the vehicle in summer. I removed it.
I would probably allow some airflow through the exhaust duct to keep things cool.
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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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