I’ve talked about it before. The more electricity you use the less you pay per unit. If my dad can clock 25,000 kms in his car he gets a larger tax return for all the travelling he’s ‘had’ to do. If he drove 40,000 kms he would pay even less per litre. I ask him why it is like this? Why do they offer larger discounts for people who use more? The given answer is that it’s very complicated but that is how it works.