I did 64 days and 3600 miles around Europe a couple of years ago for a grand total of £700 ($1100) but the year before that I did 90 days around Europe for £2600 ($4000) and late last year I toured for two weeks across Spain for £140 ($220). About £10 a day seems about right for me if I'm wild camping.

Touring can be as cheap or expensive as you want it to be.