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It honestly looks like it would cause some drag at higher speeds.
 

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Probally trips the air like my air-tabs. Im still getting 29mpg highway on my combi... I drive 50miles each way (home-work) at exactly 70... before the tabs I got 26.5...
 

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Discussion Starter · #9 ·
If anything it will help deflect causing a less amount of vortex due to contour of the body off the roof line in stock form. The duck tail will divert the airflow to over the factory body line in theory allowing a little more aero dynamic. Im just spitballing here but Im def not driving fast enoigh to see a mpg difference...maybe if I had a huge high mount rear wing off the trunk lid but not with the duck tail.
 
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