As per the $100 day, some of that went for port charges or visa fees and moto repair & tires. As stated in original post fuel prices were up and with long days on the road that eat a lot of cash. Also I am not experienced at this type of travel and speak very poor Spanish so until I figured some of it out latter in the trip some extra $ were spent.
The biggest variability in what it costs (IMHO) is how much time you have. I had six weeks and wanted to cover some area. This makes hotels look better than camping due to setup time and after 10 to 12 hours on the road you just need a place to shower and sleep. If you have the time (much better way to travel) you can check out the area and find camping spots or cheaper places to stay. If you are only burning one tank of fuel a day that is only going to be $10 to $20 a day where I was filling up at least twice a day for $20 to $40. Most Hotels or Cabins were $20 to $35 a night. I split this cost and got a room with two beds when I was riding with someone (up to $50 for a double room). Hostels were from $6.50 to $15 depending where you were.
Also my costs were higher due to which countries I was traveling in. Chile, Argentina and Brazil are going to be more expensive than Central America.
If you need to keep your costs down two things you need to do:
1. Learn to speek the local langage, (or ride with someone who can)
2. Don't get in a hurry, give yourself twice as much time as you think you will need.
Bob (aka Road Hog)