The days of the diesel engine are far from numbered, according to a Chinese company that has developed what is billed as the world's most efficient version of the self-ignition motor. Chinese company Weichai says its innovative diesel unit achieves an overall thermal efficiency of 53.09% - a new world record. This value was confirmed by the Tüv Süd testing agency North Asia and by the China Automotive Technology Research Centre, a professional testing institute for combustion engines. The news c