According to Official Guinness Records,
In March 2010 a 1988 Volkswagon Scirocco was driven 337 km from London to Manchester (UK) powered by coffee. The modified car works by heating the coffee granules in a charcoal fire, when then break down into carbon monoxide and hydrogen. The gas is then cooled and filtered before the hydrogen is combusted to drive the engine. ‘Car-puccino’ can reportedly reach 60 mph and achieved 1 mile per 56 espressos. The process works because coffee granules contain a small amount of carbon.
For a complete list of 2010 records, please visit 2010 Guinness Records in United Kingdom.