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Welcome Big Van. I think the effort that you are putting into trying to increase the FE of the van is admirable. I think that most of the regular aeromods like grille block, tire inflation, wheel skirts, etc. will help take the edge off a little. I have never seen anything for the roof of a van that would help. I think it might just make your cinder block bigger. I would stick, at least for now to the things that most of the people on this site are doing already. Heck, I am sure you would love 20 mpg.
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