My question is why not post a picture here, instead of linking some other website?
I appreciate the aerodynamics part (I just skimmed the engine details).
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And I want to test my ideas on how to make a van get20 to 30MPG...remember I started this project back in 2000.
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In the 1990s I was driving a 1961 VW panel van. You might not consider it full-sized but it was uprated from 1/2 ton to 3/4 tons axles with sway bar and gas pressurized shocks in front and air shocks in back (decambered), big 'n littles, etc. With a fresh engine rebuild I drove exactly sixty miles and refilled exactly 2 gallons. It never went 55 again.
Here's the aero kit I designed (never built). A plywood front bumper and side skirts.
The front bumper would shield a front mounted spare and the side skirts splay out from inside the front tires to outside on the rears.
I went into a restoration and got in over my head.