Way back in the early 1980's when I put a sizable front chin spoiler on my short-box Ford van (a 1976 model), the only marked improvements I recall were during windy conditions.
With front chin spoiler (in any direction wind) the van really held the road and I was able to do the speed limit safely.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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