Bicycle Touring and Sandwiches (needs expounding / edits)

Every pedal stroke burns 0.1% of a sandwich. Many strokes daily will require many sandwiches over the course of your trip. If you replace your own chain on the side of the road instead of employing a shop, you've saved yourself the cost of one sandwich. If you patch a tube three times before replacing it, you've saved yourself the cost of a good hot sandwich.