I am in the Boston area. When I had Bay State Gas in my old apartment in the winter it was about $200/month for a very, very small place. Now that the rates of gas our so high and your place is bigger than mine was (I am sure), $320 sounds about right. I have a house and oil heat now, it just cost me $450 to fill up the tank. Might last 1.5 - 2 months in the peak of winter. BTW - In that old apt., In the summer hot months my gas bill was less than $20.