Now that I've grabbed your attention with that title, think about it. In Australia at the moment, we pay approximately $1.40 a litre How much would you pay to buy a 600 ml bottle of water. In Australia it might be $2.40. That works out as $4 a litre - almost three times as much as the same amount of petrol. Surely, water would be cheaper. It is more abundant by an incredible factor, found in all countries instead of a few, can often be found pure, without the need for processing of any kind. Fuel, on the other hand, is very scarce, basically found only in the Middle East, Russia and America, is usually found deep underground, where extraction is costly, and, I would assume, needs processing before it is sold. Why is petrol so cheap, does anyone know?