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In my case, my mpg is up but it is not not really any quieter. I do have the back seat and parcel shelf removed but I think most of the noise I am hearing comes through the wheelwells. I used Dynamat on them and the trunk, modest improvement. It was much quieter with the back seat in but it limited my cargo space and weighs almost 100 lb. for that and the spare tire in the VW.
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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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