I found the following usage estimates:
Fridge use is about 1.5 pounds per day.
Furnace use is about 1.5 pounds per hour, it does not matter what temperature it is set on it matters how long it runs.
Water heater is about .5 pounds per hour.
Stove/oven not sure but it is in the range of .25 pounds per hour.
The reference is here http://www.outbackers.com/forums/index.php?showtopic=29085