LONDON , England ( CNN ) -- Britain 's Prince Charles has converted his 38-year-old Aston Martin to run on biofuel made from surplus wine , his office revealed Tuesday . Prince Charles with Camilla , Duchess of Cornwall , on a visit to a whiskey distillery in Northern Ireland last month . The car was a 21st birthday present from Queen Elizabeth , and the prince has converted it to run on 100 percent bioethanol as a way to reduce his carbon emissions , his office , Clarence House , said . The prince has also converted his other cars -- several Jaguars , an Audi and a Range Rover -- to run on 100 percent biodiesel fuel made from used cooking oil , his office added . Details of the prince 's biofuel use were made public Monday in his household 's 2008 Annual Review , which details the prince 's income and activities over the past year . The report says Charles and his household reduced their carbon footprint by 18 percent last year after switching to green electricity supplies and reducing their travel-related emissions . Charles , 59 , has a strong interest in environmental issues and rural affairs . He is active in environmental charities , and his food company , Duchy Originals , uses ingredients produced at his organic farm in Cornwall , southwestern England . The biofuels are converted and provided by Green Fuels Limited , a British company that previously provided biodiesel to power the royal train , Clarence House said . The wine used for the bioethanol comes from current vintage that remains after English wine producers reach the EU limit for annual wine production , a spokesman for Green Fuels said . The prince uses wine from a vineyard close to his Highgrove Estate , the spokesman said .
Prince Charles ' office reveals his car runs on biofuel made from surplus wine . Prince converted other cars to run on biodiesel fuel made from used cooking oil . Report says prince 's car cut carbon footprint by 50 percent last year . The prince called for strong interest in environmental issues and rural development .