Updated

A new whiskey biofuel that can be used to power cars has been developed by scientists in Edinburgh.

Researchers found a formula to make the fuel from whiskey by-products.

They combined so-called pot ale - the liquid from the copper stills distillery equipment - and the spent grains used to make whiskey, also known as draff, to produce butanol.

This form of alcohol can then be used as fuel to drive a vehicle, much like ethanol.

However, the Scottish scientists said butanol was superior to ethanol - with 25% more energy per unit volume.

Also, the biofuel can be introduced to unmodified engines with any petrol blend, whereas ethanol can only be blended up to 85% and requires engine modification.

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