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I have been running a black coroplast upper grill block on my wife's 04 Ford Explorer for about three years now, winter and summer with no overheating. I did remove it briefly before towing a heavy load over mountain passes in summer.
I ended up gluing a layer of rubber over the coroplast on the VW because kicked up rocks kept punching holes in it.
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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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