How many gallons of heating oil should I be going through a month? I filled up my tank on November 7th and my gauge stopped working so I'm not sure when to request a refill. Knocking on the sides of the tank makes it seem like it's well below half - maybe even a quarter full. Should I have used that much in two months? I'm in CT and it's been a very mild winter (70 degrees on Saturday). My oil burner is an effecient 7 year old McClain and I live in a fairly insulated 1300 sq ft Cape Cod. My oil heats my house and hot water (hot water is one of those mini tanks that connects to the oil burner that automatically heats water on demand), my stove is electric. Anyone is a similar situation care to share with me their fillup averages?