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I installed a huge air dam/chin spoiler on my 1976 short box Econoline back in 1983. Top part was metal, has a lower lip of rubber form a garage door.
I'm not sure how much it really improved MPG, but it defeated lane wandering tendencies caused by highway cross winds by an incredible amount.
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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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