Ok you made me double check the filing cabinet LOL we had 1 bill of $406 last winter ('08).... but the average is much lower than I said... the summer bills get down to $70 - $80. So it really varies depending on the season. Last winter we had relatives stay with us too... another family of 5... for over a week... so 10 people in the house... that might explain the anomaly. LOL ...lots of extra hot water and cooking!