Enjoy!
I love the idea of that type of mileage in a working van.
When we went looking for a new tow-van a few years ago, we really liked the Mercedes / Dodge Spinter diesel. A friend of mine was towing with one and getting about 26 mpg.
But the base price was too much (around $35,000).
We ended up with a new Chevy Express cargo van with V6. A decent van and almost $15,000 less than the Dodge.
By the way, I have a friend who has a Vanagon like your's with a VR6 swap. I rode in it a few weeks ago. Quick!