How about an older cummins repowered gm based stepvan with 16" wheels. Chop the top, get rid of the passenger windshield, shorten the frame if you want, and aeromod everything behind the drivers windshield.
A 3.9 bta (105hp) can push a 7'wide by 10' tall 6000# brick around 60mph and get 13-13.5 mpg. With out the intercooler (ie the 3.9bt( you can get 15mpg or better (no wind and a level road). I've lately been thinking of chopping the top off at the base of the windshield. That would that would drop the cross section area by 30-35%, and get rid of the highest front drag section of the body. you could then aero mod the front and back. Of course I live in Tx where windshields are not required, and all the speed limits keep rising. With a top speed of 60 I've parked the van for my own safety or until its moded to keep up with traffic
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