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Old 03-25-2014, 09:27 PM   #4 (permalink)
UltArc
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,025

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 994
Thanked 402 Times in 285 Posts
I am not a scientist.

In my mental wind tunnel, I see this:
-Lower the rear end puts it more into the wind
--Increasing the frontal area
--Changing the angles air normally interacts [with the underbody]
-Changes the angle of the roofline
--Ruining the already damaged airflow

An air dam is the easy way out, but your best bet is to duplicate the stock stance, but as low as acceptable for your life/conditions, and then do an underbody.
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Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
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