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mixed results
The only way to really know the impact of the mod is to do back-to-back runs with a fully warmed up vehicle on exactly the same route,with and without the mod,in rapid succession on the same day.
Otherwise,there's just too many variables which can impact your mpg.
It's why these things are developed only in a wind tunnel,where everything can be accounted for and measured to high precision.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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