The Bio-Bug has been renewed by UK engineers to run on methane gas.
Excrement flushed down the loos (toilets) of just 70 homes is sufficient to drive it 10,000 miles - a year's average motoring.
The two-litre VW Beetle convertible is said to be the first gas-powered car that does not suffer reduced recital.
Mohammed Saddiq of Bristol-based sustainable energy firm GENeco, which developed the prototype, says it will pave the method for a green motoring revolution.
He boasts that it drives similar to a conventional car and will "blow away" electric models.
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