I just read an older forum about a gentleman that took his 89 astro and turned it into a 30mpg+ diesel/ stick conversion van. I might not be able to high five a 30mpg tank, but any increase over 20hwy will be awesome. I was also considering a partial kammaback, but the rear window raises on struts, so securing it might be more difficult that I could do working in a simple 'screwdrive and wrench' garage.
BTW I had the 84 mazda b2000 that I was requesting help for a few months back. After removing the bed and custom building a plywood boat tail, I was able to achieve 33mpg over the stock 26 highway. Wish I would have had pics of it, it looks like an aeroplane
