Some people a few years ago worked out the average cost of their RTW, with a heavy bias to camping. Basically if you're moving you're buying gas and if you're not then you're buying something else. They averaged $60 a day. More recently I did a mini tour of Europe (cheaper in the east) and averaged about £60 a day. It'll vary depending on the local cost of living from $10 to $100 so there's no universal formula. Just be guided by the locals and other people's experience, wild camp if it's safe and legal by all means otherwise if it's shower day book ahead for the best price you can get at a hotel.
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