Just to note, one of the biggest (and most common) mistakes that people make out here, especially in vans, is to figure out what it costs them in fuel to deadhead, and then stop figuring. What they should be doing instead if using their Cost Per Mile (CPM) to figure out what it costs them to move. The CPM can vary wildly from one driver to the next, but if you are honest and include everything you pay for that comes from your revenue, then your CPM in a van can easily top 45 cents, considerably more if you include your own salary in that. Even if the van is paid for and you don't include your own salary, you're still looking at 30-35 cents a mile in most cases, with fuel being about 20 cents of that (in a van). Suddenly that $75 to $85 becomes $150-$200. It may be only a small cost out of pocket, but you still gotta pay the rest of it with something.
On another note, I spend the same amount on living expenses whether I'm rolling or sitting still, and I spend more on food and other things when I'm at home than I do on the road.
<EDIT: xiggi beat me by mere seconds>