Well - I think USD $50 a day would probably be a more reasonable budgetary figure. Count PacMan is, without a doubt, a wizard at keeping costs down. I live in Canada - grew up here - and I think I would have a very hard time travelling around on USD $50 (CAD $60) a day, even without any lodging expenses.

Although it is possible to 'camp rough' in Canada - meaning, pitching your tent on undeveloped land, rather than in a designated campsite - it can be quite difficult to accomplish this near the heavily populated areas. My guess is that if you were travelling on a moto with an out-of-country licence plate, you would probably encounter more hospitality than hostility if you camped somewhere that you shouldn't be using for camping - but, that's a pretty lonely existence, camping by yourself every night, and I'm not sure if the cost savings would justify what you give up so far as meeting fellow travellers in public or private campgrounds.

If I was seriously parsimonious, and really watched the nickels and dimes, I could probably go across Canada and/or the USA on USD $40 a day all in (assuming my fuel burn was that of a 500cc motorcycle) - but, it would require quite a bit of discipline, and some serious budget control. My budget suggestion for this continent, assuming you are camping and preparing your own evening and morning meals, would be somewhere around USD $40 a day PLUS FUEL. The reason I phrase it that way ('plus fuel') is that food, shelter, etc. is pretty much the same for everyone, but fuel burn will vary greatly depending on what kind of moto you have.