Let's see, I spent 89 days on the road....returning home on day 90.
Boondocked in 3 states: New Mexico, Arizona and Utah. Didn't camp anywhere where fees were required.
Best location: Valley of the Gods, Utah (assuming you get the primo spot I used)
Worst location (in terms of crowds, and noisy ass wipe types): Moab, Utah.
Expenses pie chart below, doesn't include costs involved with getting new tire, new tubes and repair items for Scarlett as not exactly camping related.
Two weeks long stays in one location key to keeping fuel costs down, but of course groceries costs go up.
26 gallons in Fresh Water Tank lasts about two weeks with normal usage, for one person. This assumes separate 5 gallons for toilet flushing duty.
Propane usage, assuming no extended cold weather, about 1/4 tank per week. Mostly used for fridge and cooking.
100 Watt Solar Panel enough to recharge battery given an average drain of 10 Amp Hours overnight. Angling the panel outside of peak solar hours remains key. Adding second panel would eliminate the need for angling of panel but then you lose flexibility in terms of panel placement when under trees and such.