Real life usage w/ 6 gallon hot water tank

Navy shower method here as well, combined with mostly doing no hook-ups camping and working with a 30 gallon gray tank. We can make that capacity last for 8 showers, so we are typically using an average of under 4 gallons of gallons of water for each.

None of us have ever run out of hot water, with that total usage each time in the shower.