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Sounds like a good start on the van! We have a few guys who have seen very good fuel economy gains from mods on their full size vans. A few percent of a lot of gas adds up fast too.
For the rear skirts, you can bring them down to where the body starts curving in. Or, you can continue to extend them down farther, but they become a lot more complex to make as you'll have to curve them around the tire. This is probably the better approach, but it is more complex.
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