TOKYO: Toyota Motor Corp plans to sell a new version of its Prius petrol-electric hybrid from the end of 2015 in Japan and in other regions thereafter, at a time when tumbling gasoline prices are sapping demand for environment-friendlier cars.The new Prius will run on smaller, lighter motors and batteries than its predecessor, and be at least 10 per cent more fuel-efficient, Toyota said, without stating mileage. The previous model can run at 51 miles a gallon.