No, that sounds about right, we go through 2 bottles a month typically, unless we've had a lot of people over , occasionally going through 3 bottles like we did over the Christmas/New years break. We run a Rinnai 20 litre instantaneous hot water system, 2 ovens and a 5 burner gas hot plate. LPG gas prices have jumped up about $75.00 a bottle in the last 18 months, likely they'll increase again this year at some stage.