I always look at what the "incremental cost" is for any vacation. So its the cost to travel to the start/return, lodging, and the small additinal cost of food.

So for me its $25/night for camping, $75/night for a motel. I can get by on a schedule of 2/3 nights camping, then a motel. So for a week the incremental cost for lodging is $225 - $250.

Travel cost is very variable, is it driving or air, Having to ship the bike, an extra night in a motel. No way to estimate since its so variable.

Food - This ALWAYS cost more. I just get very hungry riding each day vs sitting in the office typing on a computer like now. Since I have to eat either at the office or on vacation, the incremental cost/day for food is $25/day. So about $175/week over my at home food cost.

Net of all this is, I plan about an extra $500/week to bike tour + travel $$$ to start/finish.