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Welcome Eco, I have used airdams on many vehicles over the years and they do help mpg at highway speeds. As Aerohead stated they are very easy to strike on all kinds of objects even if you think you are being careful. Several of my airdams were commercially made including the GLH factory airdam I installed on my Dodge Omni. I can tell you I have broken every one. I use a full belly pan now and it is holding up very well.
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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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