The Bio-Bug has been converted by a team of British engineers to be powered by biogas, which is produced from human waste at sewage works across the country. They believe the car is a viable alternative to electric vehicles. Excrement flushed down the lavatories of just 70 homes is enough to power the car for 10,000 miles - the equivalent of one average motoring year. This conversion technology has been used in the past but the Bio-Bug is Britain's first car to run on methane gas without its performance being reduced. It can power a conventional two litre VW Beetle...