Ted,
You didn't say which coast - east or west?
West is slightly more expensive in my view. This is partly because there are less organised camp-sites, so you will either be free-camping more (which is clearly cheaper) or spending more time in hotels (which is obviously not)
I would budget a minimum of €40 per day for west coast, probably €30 per day east coast.
Two other factors will impact - east coast has far more national parks etc, so if you want to visit these your costs will rise substantially. East route will definately require a carnet, thus adding to initial cost, but reducing your average cost at borders, whereas you can do the west solely on laissez passers, which mean no initial outlay, but generally at least €20 + per border crossing.
cheers
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