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Butanol, which is our fuel, is an advanced fuel that's a four carbon alcohol, so inherently it has more energy, it has almost the same amount of energy as petrol, whereas bioethanol has only got 70 percent of it, you can store it and pipe it and use the existing infrastructure to distribute this, and in fact you do not need to modify an engine. So this is a genuine like-for-like substitution for oil or diesel - and moreover the fuel is not restricted to automobiles. It's currently being trialled in shipping industry and is a very good base unit for jet fuel.