Personally, I prefer to just check the gauge on the tank every few days as opposed to relying on the panel indicator. That being said, my panel indicator has always proven to be accurate. Propane goes a long way in our Roadtrek 210P but it is a ten gallon tank and I think you will find your Simplicity is 5.6 gallons according to the RT manual for that model.
With experience you will get a good feel for how long your propane will last based on the number of days you are using it and the types of use (cooking, heating, etc.).
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