Japan's best-known toilet maker on Thursday put a "poop-powered" motorbike on display at its showroom, saying it can drive 300 kilometres (180 miles) on a full load of gas made from animal waste.

Billed as the world's first waste-powered vehicle, the three-wheeler has a toilet in place of a regular seat and huge paper roll at the back.

But manufacturer TOTO was quick to point out that the vehicle's driver would not supply the "gas".

"The biogas it uses as fuel is not made from human waste. It's made from livestock waste and sewage," said company spokesman Kenji Fujita.

"We hope to raise awareness among customers about our green campaign through development of environmentally-friendly products such as water-saving showerheads and water-saving toilets," Fujita added.

The unique motorcycle proved a popular oddity with visitors to TOTO's showroom in a Tokyo suburb on Thursday.

"Customers seem very interested in the vehicle, some are taking photos," said a showroom official.

The company -- which makes toilets equipped with an array of features including heated seats, water jets with pressure and temperature controls, and ambient background music -- has no plans to commercialise the motorcycle.