Brent,
If you do a search through the forums for ("generator load fuel") you'l find some posts about this.
Basically, it seems that the generators use about 0.4 GPH unloaded, and up to 2.1 (some said 1.8) GPH when really loaded (A/C going etc)
As I remember one thread from people dry camping at a Nascar race, with A/C and generator going full-blast, they used about 12 gallon per day. Not enough to worry too much about. Much less if you're not running the A/C.
How long your tanks last is based upon how well you conserve when taking showers etc. I have camped with my wife, with both of us taking one shower per day, and lasted a full week, although the showers were around the 5 minute mark.
You can "sometimes" dump your grey in some places, which will help. Black water for me has rarely been an issue on a week camping.
Ray


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