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I run my tanks till they are empty one at a time of course LOL. Usually the heater will be the thing that stops working first. If I think that I am getting low on one tank and will run out before morning I will switch them over. I found out if you open the valve on the full tank first than switching the valve to the fresh tank than the heater will start right up. If you don't do this then the heater doesn't like it and takes a while to fire up. Only way I tell if tank is getting low is to look for the frost line on the tank. Sometimes you have to look hard to see it but it's there. No gadget is worth spending money on Been there done that. Top them off before every trip. Found out fast that it's expensive to fill up on the road. $3.30 a gallon. Some places charge $30 a fill no matter how much is in the tank.
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