Here's the summary of the costs for our 2007 trip to Virginia:
Cost
Lodging: $230.20
Food: 385.33
Fuel: 208.22
Fun: 139.50
Other: 80.96
==============
Total: $1044.21
Lodging: 22.05%
Food: 36.90%
Fuel: 19.94%
Fun: 13.36%
Other: 7.75%
============
100%
Total miles traveled: ~1680
Fuel - least expensive $3.04/gallon, Sheetz, Staunton, VA
- most expensive $3.33/gallon, Shell, Lenhartsville, PA
We stayed at the same location for the entire trip, so no high/low on lodging. MPG seems to be around 25mpg, decent for the spirited driving on this trip.
I have accounted the food costs a little differently than in the past; this new accounting should give more accurate figures (I am now including pre-trip purchases, in the past I haven't always done that).