United Kingdom, April 16 -- Rolls-Royce is continuing its drive towards becoming a lower carbon business with engine tests for its mtu diesel engines in Friedrichshafen, Augsburg and Ruhstorf in Germany now carried out on hydrogenated vegetable oil (HVO). By the end of 2025, the company had saved around 3,200 tonnes of CO2 as a result of switching to renewable diesel derived from vegetable oils and waste materials. Emissions of soot particles and nitrogen oxides also fell significantly.The switch began with initial test runs in September 2024, with further facilities switching over the following year until, finally, the key diesel engines of the mtu Series 4000 for ships, trains and energy systems were all being tested with HVO in Germany. ...