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I do not know what the laws are where you are but the side mirrors are one area to address. It reduces frontal area and removes an obstacle from a very messy region of airflow.
Some Ecomodders have replaced the mirrors with cameras and screens. I have removed the passenger side mirror completely and I fold in the driver’s mirror on the highway. It can be quickly unfolded for city traffic. I have tuft tested it and the airflow is better with the mirror folded. I use small convex mirrors in their place. The passenger side one is inside the car. The driver side mirror is glued to the glass of the folded mirror at the correct angle with a small aluminum bracket.
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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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