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I agree. Quite a bit of low-hanging fruit and a number of vehicles we can be inspired by.
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Recycling an old pic incase you haven't seen it.
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Drag is a direct function of wake area.
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Strike an arc from the windshield to the aft end to just clear the van body. It could carry a favorable pressure gradient further back to counter the increase in frontal area, and give a nice opportunity for skylighting and &.
Ogive curves added to the front edges of the van body.
edit: The picture was embarrasing, so I took it to the GIMP. The result is embarrassing, I can't seem to resize the Smudge tooll.