Hello all, we are new to a used 2015 Heartland Oakmont. It is being used for full time living, we turn the furnace off during the day while at work and back on at night, but it is 30 or so at night here. So, we are using propane for the furnace, hot water and cooking. We are going through a 7 gal tank every 3 to 4 days. Does that seem like way too much or normal? Thank you!