Hard to say since usage doesn't simply divide by 2: the fridge needs to run regardless of how much food there is (it matters, but not linearly), or if you watch

Hard to say since usage doesn't simply divide by 2: the fridge needs to run regardless of how much food there is (it matters, but not linearly), or if you watch a TV every evening with 2 persons or 1 doesn't show up on the bill either. Probably best to ask friends and see how they get their costs down or if, conversely, you can give them tips