Estimate of expenses on the "Neils on Wheels" tour from Pittsburgh to DC, June 2008. These are from a spreadsheet we kept.

Car rental from Limerick, PA to Pittsburgh International Airport - 133 dollars.
Gasoline - 55 dollars
Tolls - 14 dollars.
Campgrounds - 14 dollars
Dorm room at Frostburg University - 40 dollars
Hotel on first night - 64 dollars
Tour of Fallingwater - 32 dollars

Unfortunately the accounting broke down as the relationship between the riders did, so I don't have details on the food expenses beyond what I put on my credit card. Most expensive meal on tour was 35 dollars at the Firefly Grill in Ohiopyle, but that was for four people, since we treated two folks to lunch. More typical was 17 dollars for dinner at a place in Boston, PA, for two people. Wine isn't included in the total since I don't drink. I estimate, leaving aside wine, we spent about 25 dollars a day on food for each of us. The lower costs were from being treated to an occasional meal and eating in camp more often. And in my case, not eating at all one day - I was severely bonked the day following my crash and fractured rib. (Yeah, I know, that was stupid of me.)

As I noted on the notes to the subsequent trip, we could have saved substantially on costs by eating more in camp. I don't begrudge the expense, however.