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I couldn't get the link to work just now. Hmmm.
I have tried flat coroplast covers on my VW Golf and they didn't help and may have hurt my tank averages compared to the alloy 9 spoke summer wheels. Sorry, no true A-B-A testing though.
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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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