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Oh by the way, which mods have proved not to be that effective?
clean exterior, wipers, vortex generators (especially "home made" ones)... not sure how your tape on the gas tank will work either.
Make a full belly pan with the rear end at 0* (horizontal). That is the ideal angle for a "diffuser" on a one box or two box form, and a belly pan should give you a couple MPG's.
Also, what van is it?
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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