Again, there's a database.... If you want to know what the real world
fuel "economy" is, just point your browser to:
<http://www.fuelly.com/car/volkswagen/vanagon>

If you want to help increase the knowledge, sign up and track your own.

Jim's are here: http://www.fuelly.com/driver/jiminor/vanagon

and here: http://www.fuelly.com/driver/jiminor/vanagon-2

Note that Folly has been off the road since April getting an engine
transplant.

Jim