From memory, and thus rounded, my costs for my nine day August Pittsburgh to DC trip.

Car rental - King of Prussia to Pittsburgh International Airport, and Union Station, DC, to KOP - 130 dollars. Add 20 dollars for tolls on the highways, and 40 for gas.
Hotel rooms - (Cumberland and Williamsport, MD) - 130 dollars
Hostel - 15 dollars
Campgrounds - 21 dollars
Bike repairs - wheel truing - 20 dollars; replacement of chain - 25 dollars

Food easily averaged 30 dollars or more a day. I always ate out at breakfast and dinner, although "out" was often as not from a Sheetz or other mini-mart store. I would often bring something such as trail mix to eat for lunch. So let's estimate 300 for food.

Other expenses:

Batteries for camera - 10 bucks
bug spray - 10 dollars
sunscreen - 10 dollars
shipping of excess gear from Cumberland, MD - 12 dollars.
laundry - 5 dollars

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While I didn't begrudge the food expenses back in August, I note that I probably could cut a lot of the fat, so to speak, from my budget by eating in the campsite. Also, two hotel rooms were one too many considering the good weather I had.