A new hydrogen car has been unveiled that is set to try and break the world's fuel efficiency record.

British gas company BOC has co-created the BOC Ech2o, which would need just 25 watts of electricity for a 25,000-mile world trip.

The only drawback of the new super-efficient car is that it has a top speed of just 30mph.

An attempt to break the world record on fuel efficiency, which currently stands at just over 15,000mpg, is to be undertaken by go-kart driver Jack Dex, 13, at the Shell Eco Marathon in Northamptonshire this Thursday.

The Ech2o's hydrogen storage system was designed by BOC, while its body, chassis and steering system was designed by OSCar Automotive and its electric powertrain was developed by Oxford University.

BOC's director of sustainable energy, John Carolin, told the Press Association: "The lessons from this and other projects will show that hydrogen fuel cell-powered vehicles could be a practical, attractive and a viable economic alternative to diesel- or petrol-fuelled vehicles."