I ask because I've just noticed that after a dec15 fill up of 1000l, I'm down to a quarter of a tank. This is a second home so the heating is on no more than 60hrs a week, on a lowish setting boiler on setting 3 of 5, TVRs on full downstairs, and on 2 upstairs. House is a 3 bed, well insulated, sash windows with no sec glazing, but with full internal wooden shutters which we use at night. Anyway, I worked out that my heating is costing around £20 per day, afive other fiver a day on logs for the woodburner. This is my first time with oil. Can this possibly be real, or is there a serious prob with my boiler (we're in rented..). Help!