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Old 08-05-2010, 06:13 PM   #13 (permalink)
lunarhighway
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
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an aero friendly alternative would be window stickers or magnetic signs. the first would be cheap, but not possible to remove when not needed the later perhaps a little more expensive but easy removed

both would be aero neutral and maybe even more noticable than the roof mounted sign.
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