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anything will be considered. No boat tails though
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There's your challenge, set a barely attainable goal and disallow the one thing that could get you there [on it's own]. 13' doesn't sound that long. My VW Beetle is that long.
My experience averages aerohead's. 30mpg at 55mph in a stock bodied VW panel van.
How to answer the challenge? I would gets chrome exhaust stacks, mid-sized truck parts—maybe 4-6" in diameter. Mounted them at the outer ends of the rear bumper where they thoroughly obscure the stock taillights. Punch a row of louvers [exhausting innies] at about 68° to the centerline. Hook them up to your exhaust system. The big plenum on the end of the exhaust pipe will slow and cool the exhaust and then the small area of the louvers will recompress it so that the Coanda effect pulls the attached flow around the corner to pinch off and detach the low-pressure bubble in the wake.
That and complete bellypan/wheel spats. Extend the front bumper brackets and cut the tips off the bumper. Faired in, it would be just as safe as stock. Most of the bellypans you see here are Coroplast. I like PolyMetal.
OR you could do it *all* in the drivetrain with a 2WD 6-speed turbo-diesel.