How hot is your hot water relative to your BIL. It might be that you have the tank set at a much higher temp so you spend more energy to hold the water at that temperature.
Do you dry all your clothes and he hangs his to dry?
I noticed about a 15% savings by switching out all my lights to cfl/LEDs. My kitchen was the big culprit that had 8 x 60 pot lights which essentially were on all day.
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