It's amazing how easy it is to get used to the "way things work at home," where you have unlimited electric, water, hot water, sewer. Then you go out in the RV, where each of those things have limits (Hey, we're CAMPING already!) and you start finding out where your usage is profligate.
Somebody will figure out the 6 gallon water heater; running AC, microwave, coffee pot, hair dryer; doing the dishes with the water running continuously. And usually it's each of us in our newbie days. Been there, done that.
Having an RV is living in the lap of luxury -- just don't slide too far out to the edge of that lap, 'k?