Greetings!
I think everyone is spending way too much time worrying about stealth and gas mileage and not nearly enough time considering comfort...
Living in a van is much different than just occasional camping in one. Ultimate comfort is what makes the difference between looking forward to going home, and dreading it. Sacrificing a little fuel economy for me is a no brainer, comfort is more important, MUCH more important...
In the summer, it's okay to say "My living room is the great outdoors...", but what about that week or more of pouring down rain, or snow, or ice, when you're going to want to be inside and stay warm and comfortable. Are you going to have the room to do that in? It can and does happen, maybe even longer than a week... Are you going to be happy & healthy, or getting leg cramps and an aching back?
The overall difference between the costs of a full size comfortable van and a mini-van are small in comparison to the differences of livability.
Who cares if that comfortable gas guzzling van costs you an extra $100/month in fuel, that's a bargain compared to just paying the electric bill on a regular house or apartment.
A 10 MPG difference is only going to translate into about $100 @ $4.00/gal over 1,000 miles, and I doubt most people are averaging more than that mileage per month. Most people spend a whole lot more time parked than they do driving.
Just do the math, how many miles did you drive last year? Figure out the difference in gas mileage/cost versus comfort, then honestly ask yourself if your comfort is worth that amount of fuel savings. The cost of that extra comfort is probably smaller than what you thought...
That full sized van can still park in any regular parking spot, just like a mini-van. The cost of the extra gas is the only major difference.
Cheers!
The CamperVan_Man