I have a 40 gallon fresh water tank. We took 2 quick showers, a few toilet uses and a small dish washing and my tank was showing empty. What is the average dry camp water use? Seems to us, 40 gallons ...
dewey02 is correct and I misstated. Sometimes, I have been led to believe, the gallonage of water stated on specs for some rvs includes that six gallons. Only one way to know for sure would be to drain the water tank and refill it gallon by gallon to measure.
The truth is once you get accustomed to boondocking you know intuitively about how much water you have used and your faith in the idiot lights on the panel decreases.