We were in far South Texas in February 2021 when the big freeze hit and the electricity went out and Ted Cruz went to Cancun. I think it got down to the 20s, but I'm not sure. I had 2 propane tanks in a 32 foot Class A, but I think I was down to one tank. We went through that last tank in a few hours that night, and I didn't have the thermostat set that warm inside. About 3 AM I woke up and the furnace was blowing cold air. But fortunately we had 2 electric heaters and our area didn't lose electricity so it didn't get too bad. If we had lost electricity we would've been sleeping in the Jeep with its motor and heater running. The point of this rambling is you can run through propane fast on a cold night.