[timandsusan]

I wondered about that when I started RVing. I learned to take out the tank and simply shake it to see if any liquid is inside or look at the condesation line on the outside early in the morning. A little practice will develop a feel for this. Of course having two tanks help. I have only had to fill both tanks twice in 6 years. Once when I was learning and did not check the tanks to determine when one was empty. The second time was in Tulsa, OK when they had their only blizzard and I left the heat on low and ran out of propane. I was staying at relatives. The roads were not passable for 1 to 2 days.