Fuel alcohol is alcohol that is produced specifically for use as a fuel. Produced either as ethanol or methanol, it contains about half the energy of gasoline. It can be produced from sugar, trees, cassava, grain, or kelp. The longest-running program to produce fuel from alcohol is in Brazil where the product, mixed with gasoline, is called Alcool. The US experimented with a similar mixture which is called Gasohol. The first serious use, however, was by Germany in the Second World War to make fuel from wood.