I’m in a 3500 square foot house. About 15 years old well insulated. We use propane for hot water, heat (radiant on first floor and radiator on second floor), cook stove and clothes dryer. For the last 5 years or so we have done a pre buy and we use about 800 gallons per year. Winter indoor temps set at 68 when home, 64 when not home and when sleeping (controlled by smart thermostats in three zones).